Context Navigation

source: vendor/3.5.8/source3/smbd/posix_acls.c

Visit:

Last change on this file was 594, checked in by Herwig Bauernfeind, 14 years ago
Samba 3.5: Update vendor to version 3.5.8
File size: 144.4 KB

Line
1	/*
2	Unix SMB/CIFS implementation.
3	SMB NT Security Descriptor / Unix permission conversion.
4	Copyright (C) Jeremy Allison 1994-2009.
5	Copyright (C) Andreas Gruenbacher 2002.
6	Copyright (C) Simo Sorce <idra@samba.org> 2009.
7
8	This program is free software; you can redistribute it and/or modify
9	it under the terms of the GNU General Public License as published by
10	the Free Software Foundation; either version 3 of the License, or
11	(at your option) any later version.
12
13	This program is distributed in the hope that it will be useful,
14	but WITHOUT ANY WARRANTY; without even the implied warranty of
15	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16	GNU General Public License for more details.
17
18	You should have received a copy of the GNU General Public License
19	along with this program. If not, see <http://www.gnu.org/licenses/>.
20	*/
21
22	#include "includes.h"
23
24	extern struct current_user current_user;
25	extern const struct generic_mapping file_generic_mapping;
26
27	#undef DBGC_CLASS
28	#define DBGC_CLASS DBGC_ACLS
29
30	/****************************************************************************
31	Data structures representing the internal ACE format.
32	****************************************************************************/
33
34	enum ace_owner {UID_ACE, GID_ACE, WORLD_ACE};
35	enum ace_attribute {ALLOW_ACE, DENY_ACE}; /* Used for incoming NT ACLS. */
36
37	typedef union posix_id {
38	uid_t uid;
39	gid_t gid;
40	int world;
41	} posix_id;
42
43	typedef struct canon_ace {
44	struct canon_ace next, prev;
45	SMB_ACL_TAG_T type;
46	mode_t perms; /* Only use S_I(R\|W\|X)USR mode bits here. */
47	DOM_SID trustee;
48	enum ace_owner owner_type;
49	enum ace_attribute attr;
50	posix_id unix_ug;
51	uint8_t ace_flags; /* From windows ACE entry. */
52	} canon_ace;
53
54	#define ALL_ACE_PERMS (S_IRUSR\|S_IWUSR\|S_IXUSR)
55
56	/*
57	* EA format of user.SAMBA_PAI (Samba_Posix_Acl_Interitance)
58	* attribute on disk - version 1.
59	* All values are little endian.
60	*
61	* \| 1 \| 1 \| 2 \| 2 \| ....
62	* +------+------+-------------+---------------------+-------------+--------------------+
63	* \| vers \| flag \| num_entries \| num_default_entries \| ..entries.. \| default_entries... \|
64	* +------+------+-------------+---------------------+-------------+--------------------+
65	*
66	* Entry format is :
67	*
68	* \| 1 \| 4 \|
69	* +------+-------------------+
70	* \| value\| uid/gid or world \|
71	* \| type \| value \|
72	* +------+-------------------+
73	*
74	* Version 2 format. Stores extra Windows metadata about an ACL.
75	*
76	* \| 1 \| 2 \| 2 \| 2 \| ....
77	* +------+----------+-------------+---------------------+-------------+--------------------+
78	* \| vers \| ace \| num_entries \| num_default_entries \| ..entries.. \| default_entries... \|
79	* \| 2 \| type \| \| \| \| \|
80	* +------+----------+-------------+---------------------+-------------+--------------------+
81	*
82	* Entry format is :
83	*
84	* \| 1 \| 1 \| 4 \|
85	* +------+------+-------------------+
86	* \| ace \| value\| uid/gid or world \|
87	* \| flag \| type \| value \|
88	* +------+-------------------+------+
89	*
90	*/
91
92	#define PAI_VERSION_OFFSET 0
93
94	#define PAI_V1_FLAG_OFFSET 1
95	#define PAI_V1_NUM_ENTRIES_OFFSET 2
96	#define PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET 4
97	#define PAI_V1_ENTRIES_BASE 6
98	#define PAI_V1_ACL_FLAG_PROTECTED 0x1
99	#define PAI_V1_ENTRY_LENGTH 5
100
101	#define PAI_V1_VERSION 1
102
103	#define PAI_V2_TYPE_OFFSET 1
104	#define PAI_V2_NUM_ENTRIES_OFFSET 3
105	#define PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET 5
106	#define PAI_V2_ENTRIES_BASE 7
107	#define PAI_V2_ENTRY_LENGTH 6
108
109	#define PAI_V2_VERSION 2
110
111	/*
112	* In memory format of user.SAMBA_PAI attribute.
113	*/
114
115	struct pai_entry {
116	struct pai_entry next, prev;
117	uint8_t ace_flags;
118	enum ace_owner owner_type;
119	posix_id unix_ug;
120	};
121
122	struct pai_val {
123	uint16_t sd_type;
124	unsigned int num_entries;
125	struct pai_entry *entry_list;
126	unsigned int num_def_entries;
127	struct pai_entry *def_entry_list;
128	};
129
130	/************************************************************************
131	Return a uint32 of the pai_entry principal.
132	************************************************************************/
133
134	static uint32_t get_pai_entry_val(struct pai_entry *paie)
135	{
136	switch (paie->owner_type) {
137	case UID_ACE:
138	DEBUG(10,("get_pai_entry_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
139	return (uint32_t)paie->unix_ug.uid;
140	case GID_ACE:
141	DEBUG(10,("get_pai_entry_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
142	return (uint32_t)paie->unix_ug.gid;
143	case WORLD_ACE:
144	default:
145	DEBUG(10,("get_pai_entry_val: world ace\n"));
146	return (uint32_t)-1;
147	}
148	}
149
150	/************************************************************************
151	Return a uint32 of the entry principal.
152	************************************************************************/
153
154	static uint32_t get_entry_val(canon_ace *ace_entry)
155	{
156	switch (ace_entry->owner_type) {
157	case UID_ACE:
158	DEBUG(10,("get_entry_val: uid = %u\n", (unsigned int)ace_entry->unix_ug.uid ));
159	return (uint32_t)ace_entry->unix_ug.uid;
160	case GID_ACE:
161	DEBUG(10,("get_entry_val: gid = %u\n", (unsigned int)ace_entry->unix_ug.gid ));
162	return (uint32_t)ace_entry->unix_ug.gid;
163	case WORLD_ACE:
164	default:
165	DEBUG(10,("get_entry_val: world ace\n"));
166	return (uint32_t)-1;
167	}
168	}
169
170	/************************************************************************
171	Create the on-disk format (always v2 now). Caller must free.
172	************************************************************************/
173
174	static char create_pai_buf_v2(canon_ace file_ace_list,
175	canon_ace *dir_ace_list,
176	uint16_t sd_type,
177	size_t *store_size)
178	{
179	char *pai_buf = NULL;
180	canon_ace *ace_list = NULL;
181	char *entry_offset = NULL;
182	unsigned int num_entries = 0;
183	unsigned int num_def_entries = 0;
184	unsigned int i;
185
186	for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
187	num_entries++;
188	}
189
190	for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
191	num_def_entries++;
192	}
193
194	DEBUG(10,("create_pai_buf_v2: num_entries = %u, num_def_entries = %u\n", num_entries, num_def_entries ));
195
196	*store_size = PAI_V2_ENTRIES_BASE +
197	((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH);
198
199	pai_buf = (char )SMB_MALLOC(store_size);
200	if (!pai_buf) {
201	return NULL;
202	}
203
204	/* Set up the header. */
205	memset(pai_buf, '\0', PAI_V2_ENTRIES_BASE);
206	SCVAL(pai_buf,PAI_VERSION_OFFSET,PAI_V2_VERSION);
207	SSVAL(pai_buf,PAI_V2_TYPE_OFFSET, sd_type);
208	SSVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET,num_entries);
209	SSVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET,num_def_entries);
210
211	DEBUG(10,("create_pai_buf_v2: sd_type = 0x%x\n",
212	(unsigned int)sd_type ));
213
214	entry_offset = pai_buf + PAI_V2_ENTRIES_BASE;
215
216	i = 0;
217	for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
218	uint8_t type_val = (uint8_t)ace_list->owner_type;
219	uint32_t entry_val = get_entry_val(ace_list);
220
221	SCVAL(entry_offset,0,ace_list->ace_flags);
222	SCVAL(entry_offset,1,type_val);
223	SIVAL(entry_offset,2,entry_val);
224	DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
225	i,
226	(unsigned int)ace_list->ace_flags,
227	(unsigned int)type_val,
228	(unsigned int)entry_val ));
229	i++;
230	entry_offset += PAI_V2_ENTRY_LENGTH;
231	}
232
233	for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
234	uint8_t type_val = (uint8_t)ace_list->owner_type;
235	uint32_t entry_val = get_entry_val(ace_list);
236
237	SCVAL(entry_offset,0,ace_list->ace_flags);
238	SCVAL(entry_offset,1,type_val);
239	SIVAL(entry_offset,2,entry_val);
240	DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
241	i,
242	(unsigned int)ace_list->ace_flags,
243	(unsigned int)type_val,
244	(unsigned int)entry_val ));
245	i++;
246	entry_offset += PAI_V2_ENTRY_LENGTH;
247	}
248
249	return pai_buf;
250	}
251
252	/************************************************************************
253	Store the user.SAMBA_PAI attribute on disk.
254	************************************************************************/
255
256	static void store_inheritance_attributes(files_struct *fsp,
257	canon_ace *file_ace_list,
258	canon_ace *dir_ace_list,
259	uint16_t sd_type)
260	{
261	int ret;
262	size_t store_size;
263	char *pai_buf;
264
265	if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
266	return;
267	}
268
269	pai_buf = create_pai_buf_v2(file_ace_list, dir_ace_list,
270	sd_type, &store_size);
271
272	if (fsp->fh->fd != -1) {
273	ret = SMB_VFS_FSETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
274	pai_buf, store_size, 0);
275	} else {
276	ret = SMB_VFS_SETXATTR(fsp->conn, fsp->fsp_name->base_name,
277	SAMBA_POSIX_INHERITANCE_EA_NAME,
278	pai_buf, store_size, 0);
279	}
280
281	SAFE_FREE(pai_buf);
282
283	DEBUG(10,("store_inheritance_attribute: type 0x%x for file %s\n",
284	(unsigned int)sd_type,
285	fsp_str_dbg(fsp)));
286
287	if (ret == -1 && !no_acl_syscall_error(errno)) {
288	DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) ));
289	}
290	}
291
292	/************************************************************************
293	Delete the in memory inheritance info.
294	************************************************************************/
295
296	static void free_inherited_info(struct pai_val *pal)
297	{
298	if (pal) {
299	struct pai_entry paie, paie_next;
300	for (paie = pal->entry_list; paie; paie = paie_next) {
301	paie_next = paie->next;
302	SAFE_FREE(paie);
303	}
304	for (paie = pal->def_entry_list; paie; paie = paie_next) {
305	paie_next = paie->next;
306	SAFE_FREE(paie);
307	}
308	SAFE_FREE(pal);
309	}
310	}
311
312	/************************************************************************
313	Get any stored ACE flags.
314	************************************************************************/
315
316	static uint16_t get_pai_flags(struct pai_val pal, canon_ace ace_entry, bool default_ace)
317	{
318	struct pai_entry *paie;
319
320	if (!pal) {
321	return 0;
322	}
323
324	/* If the entry exists it is inherited. */
325	for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) {
326	if (ace_entry->owner_type == paie->owner_type &&
327	get_entry_val(ace_entry) == get_pai_entry_val(paie))
328	return paie->ace_flags;
329	}
330	return 0;
331	}
332
333	/************************************************************************
334	Ensure an attribute just read is valid - v1.
335	************************************************************************/
336
337	static bool check_pai_ok_v1(const char *pai_buf, size_t pai_buf_data_size)
338	{
339	uint16 num_entries;
340	uint16 num_def_entries;
341
342	if (pai_buf_data_size < PAI_V1_ENTRIES_BASE) {
343	/* Corrupted - too small. */
344	return false;
345	}
346
347	if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V1_VERSION) {
348	return false;
349	}
350
351	num_entries = SVAL(pai_buf,PAI_V1_NUM_ENTRIES_OFFSET);
352	num_def_entries = SVAL(pai_buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
353
354	/* Check the entry lists match. */
355	/* Each entry is 5 bytes (type plus 4 bytes of uid or gid). */
356
357	if (((num_entries + num_def_entries)*PAI_V1_ENTRY_LENGTH) +
358	PAI_V1_ENTRIES_BASE != pai_buf_data_size) {
359	return false;
360	}
361
362	return true;
363	}
364
365	/************************************************************************
366	Ensure an attribute just read is valid - v2.
367	************************************************************************/
368
369	static bool check_pai_ok_v2(const char *pai_buf, size_t pai_buf_data_size)
370	{
371	uint16 num_entries;
372	uint16 num_def_entries;
373
374	if (pai_buf_data_size < PAI_V2_ENTRIES_BASE) {
375	/* Corrupted - too small. */
376	return false;
377	}
378
379	if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V2_VERSION) {
380	return false;
381	}
382
383	num_entries = SVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET);
384	num_def_entries = SVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
385
386	/* Check the entry lists match. */
387	/* Each entry is 6 bytes (flags + type + 4 bytes of uid or gid). */
388
389	if (((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH) +
390	PAI_V2_ENTRIES_BASE != pai_buf_data_size) {
391	return false;
392	}
393
394	return true;
395	}
396
397	/************************************************************************
398	Decode the owner.
399	************************************************************************/
400
401	static bool get_pai_owner_type(struct pai_entry paie, const char entry_offset)
402	{
403	paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
404	switch( paie->owner_type) {
405	case UID_ACE:
406	paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
407	DEBUG(10,("get_pai_owner_type: uid = %u\n",
408	(unsigned int)paie->unix_ug.uid ));
409	break;
410	case GID_ACE:
411	paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
412	DEBUG(10,("get_pai_owner_type: gid = %u\n",
413	(unsigned int)paie->unix_ug.gid ));
414	break;
415	case WORLD_ACE:
416	paie->unix_ug.world = -1;
417	DEBUG(10,("get_pai_owner_type: world ace\n"));
418	break;
419	default:
420	DEBUG(10,("get_pai_owner_type: unknown type %u\n",
421	(unsigned int)paie->owner_type ));
422	return false;
423	}
424	return true;
425	}
426
427	/************************************************************************
428	Process v2 entries.
429	************************************************************************/
430
431	static const char create_pai_v1_entries(struct pai_val paiv,
432	const char *entry_offset,
433	bool def_entry)
434	{
435	int i;
436
437	for (i = 0; i < paiv->num_entries; i++) {
438	struct pai_entry *paie = SMB_MALLOC_P(struct pai_entry);
439	if (!paie) {
440	return NULL;
441	}
442
443	paie->ace_flags = SEC_ACE_FLAG_INHERITED_ACE;
444	if (!get_pai_owner_type(paie, entry_offset)) {
445	return NULL;
446	}
447
448	if (!def_entry) {
449	DLIST_ADD(paiv->entry_list, paie);
450	} else {
451	DLIST_ADD(paiv->def_entry_list, paie);
452	}
453	entry_offset += PAI_V1_ENTRY_LENGTH;
454	}
455	return entry_offset;
456	}
457
458	/************************************************************************
459	Convert to in-memory format from version 1.
460	************************************************************************/
461
462	static struct pai_val create_pai_val_v1(const char buf, size_t size)
463	{
464	const char *entry_offset;
465	struct pai_val *paiv = NULL;
466
467	if (!check_pai_ok_v1(buf, size)) {
468	return NULL;
469	}
470
471	paiv = SMB_MALLOC_P(struct pai_val);
472	if (!paiv) {
473	return NULL;
474	}
475
476	memset(paiv, '\0', sizeof(struct pai_val));
477
478	paiv->sd_type = (CVAL(buf,PAI_V1_FLAG_OFFSET) == PAI_V1_ACL_FLAG_PROTECTED) ?
479	SE_DESC_DACL_PROTECTED : 0;
480
481	paiv->num_entries = SVAL(buf,PAI_V1_NUM_ENTRIES_OFFSET);
482	paiv->num_def_entries = SVAL(buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
483
484	entry_offset = buf + PAI_V1_ENTRIES_BASE;
485
486	DEBUG(10,("create_pai_val: num_entries = %u, num_def_entries = %u\n",
487	paiv->num_entries, paiv->num_def_entries ));
488
489	entry_offset = create_pai_v1_entries(paiv, entry_offset, false);
490	if (entry_offset == NULL) {
491	free_inherited_info(paiv);
492	return NULL;
493	}
494	entry_offset = create_pai_v1_entries(paiv, entry_offset, true);
495	if (entry_offset == NULL) {
496	free_inherited_info(paiv);
497	return NULL;
498	}
499
500	return paiv;
501	}
502
503	/************************************************************************
504	Process v2 entries.
505	************************************************************************/
506
507	static const char create_pai_v2_entries(struct pai_val paiv,
508	unsigned int num_entries,
509	const char *entry_offset,
510	bool def_entry)
511	{
512	unsigned int i;
513
514	for (i = 0; i < num_entries; i++) {
515	struct pai_entry *paie = SMB_MALLOC_P(struct pai_entry);
516	if (!paie) {
517	return NULL;
518	}
519
520	paie->ace_flags = CVAL(entry_offset,0);
521
522	if (!get_pai_owner_type(paie, entry_offset+1)) {
523	return NULL;
524	}
525	if (!def_entry) {
526	DLIST_ADD(paiv->entry_list, paie);
527	} else {
528	DLIST_ADD(paiv->def_entry_list, paie);
529	}
530	entry_offset += PAI_V2_ENTRY_LENGTH;
531	}
532	return entry_offset;
533	}
534
535	/************************************************************************
536	Convert to in-memory format from version 2.
537	************************************************************************/
538
539	static struct pai_val create_pai_val_v2(const char buf, size_t size)
540	{
541	const char *entry_offset;
542	struct pai_val *paiv = NULL;
543
544	if (!check_pai_ok_v2(buf, size)) {
545	return NULL;
546	}
547
548	paiv = SMB_MALLOC_P(struct pai_val);
549	if (!paiv) {
550	return NULL;
551	}
552
553	memset(paiv, '\0', sizeof(struct pai_val));
554
555	paiv->sd_type = SVAL(buf,PAI_V2_TYPE_OFFSET);
556
557	paiv->num_entries = SVAL(buf,PAI_V2_NUM_ENTRIES_OFFSET);
558	paiv->num_def_entries = SVAL(buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
559
560	entry_offset = buf + PAI_V2_ENTRIES_BASE;
561
562	DEBUG(10,("create_pai_val_v2: sd_type = 0x%x num_entries = %u, num_def_entries = %u\n",
563	(unsigned int)paiv->sd_type,
564	paiv->num_entries, paiv->num_def_entries ));
565
566	entry_offset = create_pai_v2_entries(paiv, paiv->num_entries,
567	entry_offset, false);
568	if (entry_offset == NULL) {
569	free_inherited_info(paiv);
570	return NULL;
571	}
572	entry_offset = create_pai_v2_entries(paiv, paiv->num_def_entries,
573	entry_offset, true);
574	if (entry_offset == NULL) {
575	free_inherited_info(paiv);
576	return NULL;
577	}
578
579	return paiv;
580	}
581
582	/************************************************************************
583	Convert to in-memory format - from either version 1 or 2.
584	************************************************************************/
585
586	static struct pai_val create_pai_val(const char buf, size_t size)
587	{
588	if (size < 1) {
589	return NULL;
590	}
591	if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V1_VERSION) {
592	return create_pai_val_v1(buf, size);
593	} else if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V2_VERSION) {
594	return create_pai_val_v2(buf, size);
595	} else {
596	return NULL;
597	}
598	}
599
600	/************************************************************************
601	Load the user.SAMBA_PAI attribute.
602	************************************************************************/
603
604	static struct pai_val fload_inherited_info(files_struct fsp)
605	{
606	char *pai_buf;
607	size_t pai_buf_size = 1024;
608	struct pai_val *paiv = NULL;
609	ssize_t ret;
610
611	if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
612	return NULL;
613	}
614
615	if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) {
616	return NULL;
617	}
618
619	do {
620	if (fsp->fh->fd != -1) {
621	ret = SMB_VFS_FGETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
622	pai_buf, pai_buf_size);
623	} else {
624	ret = SMB_VFS_GETXATTR(fsp->conn,
625	fsp->fsp_name->base_name,
626	SAMBA_POSIX_INHERITANCE_EA_NAME,
627	pai_buf, pai_buf_size);
628	}
629
630	if (ret == -1) {
631	if (errno != ERANGE) {
632	break;
633	}
634	/* Buffer too small - enlarge it. */
635	pai_buf_size *= 2;
636	SAFE_FREE(pai_buf);
637	if (pai_buf_size > 1024*1024) {
638	return NULL; /* Limit malloc to 1mb. */
639	}
640	if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
641	return NULL;
642	}
643	} while (ret == -1);
644
645	DEBUG(10,("load_inherited_info: ret = %lu for file %s\n",
646	(unsigned long)ret, fsp_str_dbg(fsp)));
647
648	if (ret == -1) {
649	/* No attribute or not supported. */
650	#if defined(ENOATTR)
651	if (errno != ENOATTR)
652	DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
653	#else
654	if (errno != ENOSYS)
655	DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
656	#endif
657	SAFE_FREE(pai_buf);
658	return NULL;
659	}
660
661	paiv = create_pai_val(pai_buf, ret);
662
663	if (paiv) {
664	DEBUG(10,("load_inherited_info: ACL type is 0x%x for file %s\n",
665	(unsigned int)paiv->sd_type, fsp_str_dbg(fsp)));
666	}
667
668	SAFE_FREE(pai_buf);
669	return paiv;
670	}
671
672	/************************************************************************
673	Load the user.SAMBA_PAI attribute.
674	************************************************************************/
675
676	static struct pai_val load_inherited_info(const struct connection_struct conn,
677	const char *fname)
678	{
679	char *pai_buf;
680	size_t pai_buf_size = 1024;
681	struct pai_val *paiv = NULL;
682	ssize_t ret;
683
684	if (!lp_map_acl_inherit(SNUM(conn))) {
685	return NULL;
686	}
687
688	if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) {
689	return NULL;
690	}
691
692	do {
693	ret = SMB_VFS_GETXATTR(conn, fname,
694	SAMBA_POSIX_INHERITANCE_EA_NAME,
695	pai_buf, pai_buf_size);
696
697	if (ret == -1) {
698	if (errno != ERANGE) {
699	break;
700	}
701	/* Buffer too small - enlarge it. */
702	pai_buf_size *= 2;
703	SAFE_FREE(pai_buf);
704	if (pai_buf_size > 1024*1024) {
705	return NULL; /* Limit malloc to 1mb. */
706	}
707	if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
708	return NULL;
709	}
710	} while (ret == -1);
711
712	DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fname));
713
714	if (ret == -1) {
715	/* No attribute or not supported. */
716	#if defined(ENOATTR)
717	if (errno != ENOATTR)
718	DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
719	#else
720	if (errno != ENOSYS)
721	DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
722	#endif
723	SAFE_FREE(pai_buf);
724	return NULL;
725	}
726
727	paiv = create_pai_val(pai_buf, ret);
728
729	if (paiv) {
730	DEBUG(10,("load_inherited_info: ACL type 0x%x for file %s\n",
731	(unsigned int)paiv->sd_type,
732	fname));
733	}
734
735	SAFE_FREE(pai_buf);
736	return paiv;
737	}
738
739	/****************************************************************************
740	Functions to manipulate the internal ACE format.
741	****************************************************************************/
742
743	/****************************************************************************
744	Count a linked list of canonical ACE entries.
745	****************************************************************************/
746
747	static size_t count_canon_ace_list( canon_ace *l_head )
748	{
749	size_t count = 0;
750	canon_ace *ace;
751
752	for (ace = l_head; ace; ace = ace->next)
753	count++;
754
755	return count;
756	}
757
758	/****************************************************************************
759	Free a linked list of canonical ACE entries.
760	****************************************************************************/
761
762	static void free_canon_ace_list( canon_ace *l_head )
763	{
764	canon_ace list, next;
765
766	for (list = l_head; list; list = next) {
767	next = list->next;
768	DLIST_REMOVE(l_head, list);
769	SAFE_FREE(list);
770	}
771	}
772
773	/****************************************************************************
774	Function to duplicate a canon_ace entry.
775	****************************************************************************/
776
777	static canon_ace dup_canon_ace( canon_ace src_ace)
778	{
779	canon_ace *dst_ace = SMB_MALLOC_P(canon_ace);
780
781	if (dst_ace == NULL)
782	return NULL;
783
784	dst_ace = src_ace;
785	dst_ace->prev = dst_ace->next = NULL;
786	return dst_ace;
787	}
788
789	/****************************************************************************
790	Print out a canon ace.
791	****************************************************************************/
792
793	static void print_canon_ace(canon_ace *pace, int num)
794	{
795	dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
796	dbgtext( "SID = %s ", sid_string_dbg(&pace->trustee));
797	if (pace->owner_type == UID_ACE) {
798	const char *u_name = uidtoname(pace->unix_ug.uid);
799	dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.uid, u_name );
800	} else if (pace->owner_type == GID_ACE) {
801	char *g_name = gidtoname(pace->unix_ug.gid);
802	dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.gid, g_name );
803	} else
804	dbgtext( "other ");
805	switch (pace->type) {
806	case SMB_ACL_USER:
807	dbgtext( "SMB_ACL_USER ");
808	break;
809	case SMB_ACL_USER_OBJ:
810	dbgtext( "SMB_ACL_USER_OBJ ");
811	break;
812	case SMB_ACL_GROUP:
813	dbgtext( "SMB_ACL_GROUP ");
814	break;
815	case SMB_ACL_GROUP_OBJ:
816	dbgtext( "SMB_ACL_GROUP_OBJ ");
817	break;
818	case SMB_ACL_OTHER:
819	dbgtext( "SMB_ACL_OTHER ");
820	break;
821	default:
822	dbgtext( "MASK " );
823	break;
824	}
825
826	dbgtext( "ace_flags = 0x%x ", (unsigned int)pace->ace_flags);
827	dbgtext( "perms ");
828	dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
829	dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
830	dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
831	}
832
833	/****************************************************************************
834	Print out a canon ace list.
835	****************************************************************************/
836
837	static void print_canon_ace_list(const char name, canon_ace ace_list)
838	{
839	int count = 0;
840
841	if( DEBUGLVL( 10 )) {
842	dbgtext( "print_canon_ace_list: %s\n", name );
843	for (;ace_list; ace_list = ace_list->next, count++)
844	print_canon_ace(ace_list, count );
845	}
846	}
847
848	/****************************************************************************
849	Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R\|W\|X)USR bits).
850	****************************************************************************/
851
852	static mode_t convert_permset_to_mode_t(connection_struct *conn, SMB_ACL_PERMSET_T permset)
853	{
854	mode_t ret = 0;
855
856	ret \|= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRUSR : 0);
857	ret \|= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
858	ret \|= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0);
859
860	return ret;
861	}
862
863	/****************************************************************************
864	Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R\|W\|X)USR bits).
865	****************************************************************************/
866
867	static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask)
868	{
869	mode_t ret = 0;
870
871	if (mode & r_mask)
872	ret \|= S_IRUSR;
873	if (mode & w_mask)
874	ret \|= S_IWUSR;
875	if (mode & x_mask)
876	ret \|= S_IXUSR;
877
878	return ret;
879	}
880
881	/****************************************************************************
882	Map canon_ace permissions (a mode_t containing only S_(R\|W\|X)USR bits) to
883	an SMB_ACL_PERMSET_T.
884	****************************************************************************/
885
886	static int map_acl_perms_to_permset(connection_struct conn, mode_t mode, SMB_ACL_PERMSET_T p_permset)
887	{
888	if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1)
889	return -1;
890	if (mode & S_IRUSR) {
891	if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1)
892	return -1;
893	}
894	if (mode & S_IWUSR) {
895	if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1)
896	return -1;
897	}
898	if (mode & S_IXUSR) {
899	if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1)
900	return -1;
901	}
902	return 0;
903	}
904
905	/****************************************************************************
906	Function to create owner and group SIDs from a SMB_STRUCT_STAT.
907	****************************************************************************/
908
909	void create_file_sids(const SMB_STRUCT_STAT psbuf, DOM_SID powner_sid, DOM_SID *pgroup_sid)
910	{
911	uid_to_sid( powner_sid, psbuf->st_ex_uid );
912	gid_to_sid( pgroup_sid, psbuf->st_ex_gid );
913	}
914
915	/****************************************************************************
916	Merge aces with a common sid - if both are allow or deny, OR the permissions together and
917	delete the second one. If the first is deny, mask the permissions off and delete the allow
918	if the permissions become zero, delete the deny if the permissions are non zero.
919	****************************************************************************/
920
921	static void merge_aces( canon_ace **pp_list_head, bool dir_acl)
922	{
923	canon_ace l_head = pp_list_head;
924	canon_ace *curr_ace_outer;
925	canon_ace *curr_ace_outer_next;
926
927	/*
928	* First, merge allow entries with identical SIDs, and deny entries
929	* with identical SIDs.
930	*/
931
932	for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
933	canon_ace *curr_ace;
934	canon_ace *curr_ace_next;
935
936	curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
937
938	for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
939	bool can_merge = false;
940
941	curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
942
943	/* For file ACLs we can merge if the SIDs and ALLOW/DENY
944	* types are the same. For directory acls we must also
945	* ensure the POSIX ACL types are the same. */
946
947	if (!dir_acl) {
948	can_merge = (sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
949	(curr_ace->attr == curr_ace_outer->attr));
950	} else {
951	can_merge = (sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
952	(curr_ace->type == curr_ace_outer->type) &&
953	(curr_ace->attr == curr_ace_outer->attr));
954	}
955
956	if (can_merge) {
957	if( DEBUGLVL( 10 )) {
958	dbgtext("merge_aces: Merging ACE's\n");
959	print_canon_ace( curr_ace_outer, 0);
960	print_canon_ace( curr_ace, 0);
961	}
962
963	/* Merge two allow or two deny ACE's. */
964
965	/* Theoretically we shouldn't merge a dir ACE if
966	* one ACE has the CI flag set, and the other
967	* ACE has the OI flag set, but this is rare
968	* enough we can ignore it. */
969
970	curr_ace_outer->perms \|= curr_ace->perms;
971	curr_ace_outer->ace_flags \|= curr_ace->ace_flags;
972	DLIST_REMOVE(l_head, curr_ace);
973	SAFE_FREE(curr_ace);
974	curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
975	}
976	}
977	}
978
979	/*
980	* Now go through and mask off allow permissions with deny permissions.
981	* We can delete either the allow or deny here as we know that each SID
982	* appears only once in the list.
983	*/
984
985	for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
986	canon_ace *curr_ace;
987	canon_ace *curr_ace_next;
988
989	curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
990
991	for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
992
993	curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
994
995	/*
996	* Subtract ACE's with different entries. Due to the ordering constraints
997	* we've put on the ACL, we know the deny must be the first one.
998	*/
999
1000	if (sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
1001	(curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
1002
1003	if( DEBUGLVL( 10 )) {
1004	dbgtext("merge_aces: Masking ACE's\n");
1005	print_canon_ace( curr_ace_outer, 0);
1006	print_canon_ace( curr_ace, 0);
1007	}
1008
1009	curr_ace->perms &= ~curr_ace_outer->perms;
1010
1011	if (curr_ace->perms == 0) {
1012
1013	/*
1014	* The deny overrides the allow. Remove the allow.
1015	*/
1016
1017	DLIST_REMOVE(l_head, curr_ace);
1018	SAFE_FREE(curr_ace);
1019	curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
1020
1021	} else {
1022
1023	/*
1024	* Even after removing permissions, there
1025	* are still allow permissions - delete the deny.
1026	* It is safe to delete the deny here,
1027	* as we are guarenteed by the deny first
1028	* ordering that all the deny entries for
1029	* this SID have already been merged into one
1030	* before we can get to an allow ace.
1031	*/
1032
1033	DLIST_REMOVE(l_head, curr_ace_outer);
1034	SAFE_FREE(curr_ace_outer);
1035	break;
1036	}
1037	}
1038
1039	} /* end for curr_ace */
1040	} /* end for curr_ace_outer */
1041
1042	/* We may have modified the list. */
1043
1044	*pp_list_head = l_head;
1045	}
1046
1047	/****************************************************************************
1048	Check if we need to return NT4.x compatible ACL entries.
1049	****************************************************************************/
1050
1051	bool nt4_compatible_acls(void)
1052	{
1053	int compat = lp_acl_compatibility();
1054
1055	if (compat == ACL_COMPAT_AUTO) {
1056	enum remote_arch_types ra_type = get_remote_arch();
1057
1058	/* Automatically adapt to client */
1059	return (ra_type <= RA_WINNT);
1060	} else
1061	return (compat == ACL_COMPAT_WINNT);
1062	}
1063
1064
1065	/****************************************************************************
1066	Map canon_ace perms to permission bits NT.
1067	The attr element is not used here - we only process deny entries on set,
1068	not get. Deny entries are implicit on get with ace->perms = 0.
1069	****************************************************************************/
1070
1071	uint32_t map_canon_ace_perms(int snum,
1072	enum security_ace_type *pacl_type,
1073	mode_t perms,
1074	bool directory_ace)
1075	{
1076	uint32_t nt_mask = 0;
1077
1078	*pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
1079
1080	if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
1081	if (directory_ace) {
1082	nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
1083	} else {
1084	nt_mask = (UNIX_ACCESS_RWX & ~DELETE_ACCESS);
1085	}
1086	} else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
1087	/*
1088	* Windows NT refuses to display ACEs with no permissions in them (but
1089	* they are perfectly legal with Windows 2000). If the ACE has empty
1090	* permissions we cannot use 0, so we use the otherwise unused
1091	* WRITE_OWNER permission, which we ignore when we set an ACL.
1092	* We abstract this into a #define of UNIX_ACCESS_NONE to allow this
1093	* to be changed in the future.
1094	*/
1095
1096	if (nt4_compatible_acls())
1097	nt_mask = UNIX_ACCESS_NONE;
1098	else
1099	nt_mask = 0;
1100	} else {
1101	if (directory_ace) {
1102	nt_mask \|= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
1103	nt_mask \|= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
1104	nt_mask \|= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
1105	} else {
1106	nt_mask \|= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
1107	nt_mask \|= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
1108	nt_mask \|= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
1109	}
1110	}
1111
1112	if ((perms & S_IWUSR) && lp_dos_filemode(snum)) {
1113	nt_mask \|= (SEC_STD_WRITE_DAC\|SEC_STD_WRITE_OWNER\|DELETE_ACCESS);
1114	}
1115
1116	DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
1117	(unsigned int)perms, (unsigned int)nt_mask ));
1118
1119	return nt_mask;
1120	}
1121
1122	/****************************************************************************
1123	Map NT perms to a UNIX mode_t.
1124	****************************************************************************/
1125
1126	#define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA\|FILE_READ_EA\|FILE_READ_ATTRIBUTES)
1127	#define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA\|FILE_APPEND_DATA\|FILE_WRITE_EA\|FILE_WRITE_ATTRIBUTES)
1128	#define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
1129
1130	static mode_t map_nt_perms( uint32 *mask, int type)
1131	{
1132	mode_t mode = 0;
1133
1134	switch(type) {
1135	case S_IRUSR:
1136	if((*mask) & GENERIC_ALL_ACCESS)
1137	mode = S_IRUSR\|S_IWUSR\|S_IXUSR;
1138	else {
1139	mode \|= ((*mask) & (GENERIC_READ_ACCESS\|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
1140	mode \|= ((*mask) & (GENERIC_WRITE_ACCESS\|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
1141	mode \|= ((*mask) & (GENERIC_EXECUTE_ACCESS\|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
1142	}
1143	break;
1144	case S_IRGRP:
1145	if((*mask) & GENERIC_ALL_ACCESS)
1146	mode = S_IRGRP\|S_IWGRP\|S_IXGRP;
1147	else {
1148	mode \|= ((*mask) & (GENERIC_READ_ACCESS\|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
1149	mode \|= ((*mask) & (GENERIC_WRITE_ACCESS\|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
1150	mode \|= ((*mask) & (GENERIC_EXECUTE_ACCESS\|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
1151	}
1152	break;
1153	case S_IROTH:
1154	if((*mask) & GENERIC_ALL_ACCESS)
1155	mode = S_IROTH\|S_IWOTH\|S_IXOTH;
1156	else {
1157	mode \|= ((*mask) & (GENERIC_READ_ACCESS\|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
1158	mode \|= ((*mask) & (GENERIC_WRITE_ACCESS\|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
1159	mode \|= ((*mask) & (GENERIC_EXECUTE_ACCESS\|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
1160	}
1161	break;
1162	}
1163
1164	return mode;
1165	}
1166
1167	/****************************************************************************
1168	Unpack a SEC_DESC into a UNIX owner and group.
1169	****************************************************************************/
1170
1171	NTSTATUS unpack_nt_owners(int snum, uid_t puser, gid_t pgrp, uint32 security_info_sent, const SEC_DESC *psd)
1172	{
1173	DOM_SID owner_sid;
1174	DOM_SID grp_sid;
1175
1176	*puser = (uid_t)-1;
1177	*pgrp = (gid_t)-1;
1178
1179	if(security_info_sent == 0) {
1180	DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1181	return NT_STATUS_OK;
1182	}
1183
1184	/*
1185	* Validate the owner and group SID's.
1186	*/
1187
1188	memset(&owner_sid, '\0', sizeof(owner_sid));
1189	memset(&grp_sid, '\0', sizeof(grp_sid));
1190
1191	DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1192
1193	/*
1194	* Don't immediately fail if the owner sid cannot be validated.
1195	* This may be a group chown only set.
1196	*/
1197
1198	if (security_info_sent & OWNER_SECURITY_INFORMATION) {
1199	sid_copy(&owner_sid, psd->owner_sid);
1200	if (!sid_to_uid(&owner_sid, puser)) {
1201	if (lp_force_unknown_acl_user(snum)) {
1202	/* this allows take ownership to work
1203	* reasonably */
1204	*puser = current_user.ut.uid;
1205	} else {
1206	DEBUG(3,("unpack_nt_owners: unable to validate"
1207	" owner sid for %s\n",
1208	sid_string_dbg(&owner_sid)));
1209	return NT_STATUS_INVALID_OWNER;
1210	}
1211	}
1212	DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1213	(unsigned int)*puser ));
1214	}
1215
1216	/*
1217	* Don't immediately fail if the group sid cannot be validated.
1218	* This may be an owner chown only set.
1219	*/
1220
1221	if (security_info_sent & GROUP_SECURITY_INFORMATION) {
1222	sid_copy(&grp_sid, psd->group_sid);
1223	if (!sid_to_gid( &grp_sid, pgrp)) {
1224	if (lp_force_unknown_acl_user(snum)) {
1225	/* this allows take group ownership to work
1226	* reasonably */
1227	*pgrp = current_user.ut.gid;
1228	} else {
1229	DEBUG(3,("unpack_nt_owners: unable to validate"
1230	" group sid.\n"));
1231	return NT_STATUS_INVALID_OWNER;
1232	}
1233	}
1234	DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1235	(unsigned int)*pgrp));
1236	}
1237
1238	DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1239
1240	return NT_STATUS_OK;
1241	}
1242
1243	/****************************************************************************
1244	Ensure the enforced permissions for this share apply.
1245	****************************************************************************/
1246
1247	static void apply_default_perms(const struct share_params *params,
1248	const bool is_directory, canon_ace *pace,
1249	mode_t type)
1250	{
1251	mode_t and_bits = (mode_t)0;
1252	mode_t or_bits = (mode_t)0;
1253
1254	/* Get the initial bits to apply. */
1255
1256	if (is_directory) {
1257	and_bits = lp_dir_security_mask(params->service);
1258	or_bits = lp_force_dir_security_mode(params->service);
1259	} else {
1260	and_bits = lp_security_mask(params->service);
1261	or_bits = lp_force_security_mode(params->service);
1262	}
1263
1264	/* Now bounce them into the S_USR space. */
1265	switch(type) {
1266	case S_IRUSR:
1267	/* Ensure owner has read access. */
1268	pace->perms \|= S_IRUSR;
1269	if (is_directory)
1270	pace->perms \|= (S_IWUSR\|S_IXUSR);
1271	and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1272	or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1273	break;
1274	case S_IRGRP:
1275	and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1276	or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1277	break;
1278	case S_IROTH:
1279	and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1280	or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1281	break;
1282	}
1283
1284	pace->perms = ((pace->perms & and_bits)\|or_bits);
1285	}
1286
1287	/****************************************************************************
1288	Check if a given uid/SID is in a group gid/SID. This is probably very
1289	expensive and will need optimisation. A lot of optimisation :-). JRA.
1290	****************************************************************************/
1291
1292	static bool uid_entry_in_group( canon_ace uid_ace, canon_ace group_ace )
1293	{
1294	const char *u_name = NULL;
1295
1296	/* "Everyone" always matches every uid. */
1297
1298	if (sid_equal(&group_ace->trustee, &global_sid_World))
1299	return True;
1300
1301	/*
1302	* if it's the current user, we already have the unix token
1303	* and don't need to do the complex user_in_group_sid() call
1304	*/
1305	if (uid_ace->unix_ug.uid == current_user.ut.uid) {
1306	size_t i;
1307
1308	if (group_ace->unix_ug.gid == current_user.ut.gid) {
1309	return True;
1310	}
1311
1312	for (i=0; i < current_user.ut.ngroups; i++) {
1313	if (group_ace->unix_ug.gid == current_user.ut.groups[i]) {
1314	return True;
1315	}
1316	}
1317	}
1318
1319	/* u_name talloc'ed off tos. */
1320	u_name = uidtoname(uid_ace->unix_ug.uid);
1321	if (!u_name) {
1322	return False;
1323	}
1324
1325	/*
1326	* user_in_group_sid() uses create_token_from_username()
1327	* which creates an artificial NT token given just a username,
1328	* so this is not reliable for users from foreign domains
1329	* exported by winbindd!
1330	*/
1331	return user_in_group_sid(u_name, &group_ace->trustee);
1332	}
1333
1334	/****************************************************************************
1335	A well formed POSIX file or default ACL has at least 3 entries, a
1336	SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1337	In addition, the owner must always have at least read access.
1338	When using this call on get_acl, the pst struct is valid and contains
1339	the mode of the file. When using this call on set_acl, the pst struct has
1340	been modified to have a mode containing the default for this file or directory
1341	type.
1342	****************************************************************************/
1343
1344	static bool ensure_canon_entry_valid(canon_ace **pp_ace,
1345	const struct share_params *params,
1346	const bool is_directory,
1347	const DOM_SID *pfile_owner_sid,
1348	const DOM_SID *pfile_grp_sid,
1349	const SMB_STRUCT_STAT *pst,
1350	bool setting_acl)
1351	{
1352	canon_ace *pace;
1353	bool got_user = False;
1354	bool got_grp = False;
1355	bool got_other = False;
1356	canon_ace *pace_other = NULL;
1357
1358	for (pace = *pp_ace; pace; pace = pace->next) {
1359	if (pace->type == SMB_ACL_USER_OBJ) {
1360
1361	if (setting_acl)
1362	apply_default_perms(params, is_directory, pace, S_IRUSR);
1363	got_user = True;
1364
1365	} else if (pace->type == SMB_ACL_GROUP_OBJ) {
1366
1367	/*
1368	* Ensure create mask/force create mode is respected on set.
1369	*/
1370
1371	if (setting_acl)
1372	apply_default_perms(params, is_directory, pace, S_IRGRP);
1373	got_grp = True;
1374
1375	} else if (pace->type == SMB_ACL_OTHER) {
1376
1377	/*
1378	* Ensure create mask/force create mode is respected on set.
1379	*/
1380
1381	if (setting_acl)
1382	apply_default_perms(params, is_directory, pace, S_IROTH);
1383	got_other = True;
1384	pace_other = pace;
1385	}
1386	}
1387
1388	if (!got_user) {
1389	if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1390	DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1391	return False;
1392	}
1393
1394	ZERO_STRUCTP(pace);
1395	pace->type = SMB_ACL_USER_OBJ;
1396	pace->owner_type = UID_ACE;
1397	pace->unix_ug.uid = pst->st_ex_uid;
1398	pace->trustee = *pfile_owner_sid;
1399	pace->attr = ALLOW_ACE;
1400
1401	if (setting_acl) {
1402	/* See if the owning user is in any of the other groups in
1403	the ACE. If so, OR in the permissions from that group. */
1404
1405	bool group_matched = False;
1406	canon_ace *pace_iter;
1407
1408	for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1409	if (pace_iter->type == SMB_ACL_GROUP_OBJ \|\| pace_iter->type == SMB_ACL_GROUP) {
1410	if (uid_entry_in_group(pace, pace_iter)) {
1411	pace->perms \|= pace_iter->perms;
1412	group_matched = True;
1413	}
1414	}
1415	}
1416
1417	/* If we only got an "everyone" perm, just use that. */
1418	if (!group_matched) {
1419	if (got_other)
1420	pace->perms = pace_other->perms;
1421	else
1422	pace->perms = 0;
1423	}
1424
1425	apply_default_perms(params, is_directory, pace, S_IRUSR);
1426	} else {
1427	pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1428	}
1429
1430	DLIST_ADD(*pp_ace, pace);
1431	}
1432
1433	if (!got_grp) {
1434	if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1435	DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1436	return False;
1437	}
1438
1439	ZERO_STRUCTP(pace);
1440	pace->type = SMB_ACL_GROUP_OBJ;
1441	pace->owner_type = GID_ACE;
1442	pace->unix_ug.uid = pst->st_ex_gid;
1443	pace->trustee = *pfile_grp_sid;
1444	pace->attr = ALLOW_ACE;
1445	if (setting_acl) {
1446	/* If we only got an "everyone" perm, just use that. */
1447	if (got_other)
1448	pace->perms = pace_other->perms;
1449	else
1450	pace->perms = 0;
1451	apply_default_perms(params, is_directory, pace, S_IRGRP);
1452	} else {
1453	pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1454	}
1455
1456	DLIST_ADD(*pp_ace, pace);
1457	}
1458
1459	if (!got_other) {
1460	if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1461	DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1462	return False;
1463	}
1464
1465	ZERO_STRUCTP(pace);
1466	pace->type = SMB_ACL_OTHER;
1467	pace->owner_type = WORLD_ACE;
1468	pace->unix_ug.world = -1;
1469	pace->trustee = global_sid_World;
1470	pace->attr = ALLOW_ACE;
1471	if (setting_acl) {
1472	pace->perms = 0;
1473	apply_default_perms(params, is_directory, pace, S_IROTH);
1474	} else
1475	pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1476
1477	DLIST_ADD(*pp_ace, pace);
1478	}
1479
1480	return True;
1481	}
1482
1483	/****************************************************************************
1484	Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1485	If it does not have them, check if there are any entries where the trustee is the
1486	file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1487	****************************************************************************/
1488
1489	static void check_owning_objs(canon_ace ace, DOM_SID pfile_owner_sid, DOM_SID *pfile_grp_sid)
1490	{
1491	bool got_user_obj, got_group_obj;
1492	canon_ace *current_ace;
1493	int i, entries;
1494
1495	entries = count_canon_ace_list(ace);
1496	got_user_obj = False;
1497	got_group_obj = False;
1498
1499	for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1500	if (current_ace->type == SMB_ACL_USER_OBJ)
1501	got_user_obj = True;
1502	else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1503	got_group_obj = True;
1504	}
1505	if (got_user_obj && got_group_obj) {
1506	DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1507	return;
1508	}
1509
1510	for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1511	if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1512	sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1513	current_ace->type = SMB_ACL_USER_OBJ;
1514	got_user_obj = True;
1515	}
1516	if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1517	sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1518	current_ace->type = SMB_ACL_GROUP_OBJ;
1519	got_group_obj = True;
1520	}
1521	}
1522	if (!got_user_obj)
1523	DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1524	if (!got_group_obj)
1525	DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1526	}
1527
1528	/****************************************************************************
1529	If an ACE entry is SMB_ACL_USER_OBJ and not CREATOR_OWNER, map to SMB_ACL_USER.
1530	If an ACE entry is SMB_ACL_GROUP_OBJ and not CREATOR_GROUP, map to SMB_ACL_GROUP
1531	****************************************************************************/
1532
1533	static bool dup_owning_ace(canon_ace dir_ace, canon_ace ace)
1534	{
1535	/* dir ace must be followings.
1536	SMB_ACL_USER_OBJ : trustee(CREATOR_OWNER) -> Posix ACL d:u::perm
1537	SMB_ACL_USER : not trustee -> Posix ACL u:user:perm
1538	SMB_ACL_USER_OBJ : trustee -> convert to SMB_ACL_USER : trustee
1539	Posix ACL u:trustee:perm
1540
1541	SMB_ACL_GROUP_OBJ: trustee(CREATOR_GROUP) -> Posix ACL d:g::perm
1542	SMB_ACL_GROUP : not trustee -> Posix ACL g:group:perm
1543	SMB_ACL_GROUP_OBJ: trustee -> convert to SMB_ACL_GROUP : trustee
1544	Posix ACL g:trustee:perm
1545	*/
1546
1547	if (ace->type == SMB_ACL_USER_OBJ &&
1548	!(sid_equal(&ace->trustee, &global_sid_Creator_Owner))) {
1549	canon_ace *dup_ace = dup_canon_ace(ace);
1550
1551	if (dup_ace == NULL) {
1552	return false;
1553	}
1554	dup_ace->type = SMB_ACL_USER;
1555	DLIST_ADD_END(dir_ace, dup_ace, canon_ace *);
1556	}
1557
1558	if (ace->type == SMB_ACL_GROUP_OBJ &&
1559	!(sid_equal(&ace->trustee, &global_sid_Creator_Group))) {
1560	canon_ace *dup_ace = dup_canon_ace(ace);
1561
1562	if (dup_ace == NULL) {
1563	return false;
1564	}
1565	dup_ace->type = SMB_ACL_GROUP;
1566	DLIST_ADD_END(dir_ace, dup_ace, canon_ace *);
1567	}
1568
1569	return true;
1570	}
1571
1572	/****************************************************************************
1573	Unpack a SEC_DESC into two canonical ace lists.
1574	****************************************************************************/
1575
1576	static bool create_canon_ace_lists(files_struct *fsp,
1577	const SMB_STRUCT_STAT *pst,
1578	DOM_SID *pfile_owner_sid,
1579	DOM_SID *pfile_grp_sid,
1580	canon_ace **ppfile_ace,
1581	canon_ace **ppdir_ace,
1582	const SEC_ACL *dacl)
1583	{
1584	bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1585	canon_ace *file_ace = NULL;
1586	canon_ace *dir_ace = NULL;
1587	canon_ace *current_ace = NULL;
1588	bool got_dir_allow = False;
1589	bool got_file_allow = False;
1590	int i, j;
1591
1592	*ppfile_ace = NULL;
1593	*ppdir_ace = NULL;
1594
1595	/*
1596	* Convert the incoming ACL into a more regular form.
1597	*/
1598
1599	for(i = 0; i < dacl->num_aces; i++) {
1600	SEC_ACE *psa = &dacl->aces[i];
1601
1602	if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1603	DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1604	return False;
1605	}
1606
1607	if (nt4_compatible_acls()) {
1608	/*
1609	* The security mask may be UNIX_ACCESS_NONE which should map into
1610	* no permissions (we overload the WRITE_OWNER bit for this) or it
1611	* should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1612	* to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1613	*/
1614
1615	/*
1616	* Convert GENERIC bits to specific bits.
1617	*/
1618
1619	se_map_generic(&psa->access_mask, &file_generic_mapping);
1620
1621	psa->access_mask &= (UNIX_ACCESS_NONE\|FILE_ALL_ACCESS);
1622
1623	if(psa->access_mask != UNIX_ACCESS_NONE)
1624	psa->access_mask &= ~UNIX_ACCESS_NONE;
1625	}
1626	}
1627
1628	/*
1629	* Deal with the fact that NT 4.x re-writes the canonical format
1630	* that we return for default ACLs. If a directory ACE is identical
1631	* to a inherited directory ACE then NT changes the bits so that the
1632	* first ACE is set to OI\|IO and the second ACE for this SID is set
1633	* to CI. We need to repair this. JRA.
1634	*/
1635
1636	for(i = 0; i < dacl->num_aces; i++) {
1637	SEC_ACE *psa1 = &dacl->aces[i];
1638
1639	for (j = i + 1; j < dacl->num_aces; j++) {
1640	SEC_ACE *psa2 = &dacl->aces[j];
1641
1642	if (psa1->access_mask != psa2->access_mask)
1643	continue;
1644
1645	if (!sid_equal(&psa1->trustee, &psa2->trustee))
1646	continue;
1647
1648	/*
1649	* Ok - permission bits and SIDs are equal.
1650	* Check if flags were re-written.
1651	*/
1652
1653	if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1654
1655	psa1->flags \|= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT\|SEC_ACE_FLAG_OBJECT_INHERIT));
1656	psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT\|SEC_ACE_FLAG_OBJECT_INHERIT);
1657
1658	} else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1659
1660	psa2->flags \|= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT\|SEC_ACE_FLAG_OBJECT_INHERIT));
1661	psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT\|SEC_ACE_FLAG_OBJECT_INHERIT);
1662
1663	}
1664	}
1665	}
1666
1667	for(i = 0; i < dacl->num_aces; i++) {
1668	SEC_ACE *psa = &dacl->aces[i];
1669
1670	/*
1671	* Create a cannon_ace entry representing this NT DACL ACE.
1672	*/
1673
1674	if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1675	free_canon_ace_list(file_ace);
1676	free_canon_ace_list(dir_ace);
1677	DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1678	return False;
1679	}
1680
1681	ZERO_STRUCTP(current_ace);
1682
1683	sid_copy(&current_ace->trustee, &psa->trustee);
1684
1685	/*
1686	* Try and work out if the SID is a user or group
1687	* as we need to flag these differently for POSIX.
1688	* Note what kind of a POSIX ACL this should map to.
1689	*/
1690
1691	if( sid_equal(&current_ace->trustee, &global_sid_World)) {
1692	current_ace->owner_type = WORLD_ACE;
1693	current_ace->unix_ug.world = -1;
1694	current_ace->type = SMB_ACL_OTHER;
1695	} else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1696	current_ace->owner_type = UID_ACE;
1697	current_ace->unix_ug.uid = pst->st_ex_uid;
1698	current_ace->type = SMB_ACL_USER_OBJ;
1699
1700	/*
1701	* The Creator Owner entry only specifies inheritable permissions,
1702	* never access permissions. WinNT doesn't always set the ACE to
1703	* INHERIT_ONLY, though.
1704	*/
1705
1706	psa->flags \|= SEC_ACE_FLAG_INHERIT_ONLY;
1707
1708	} else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1709	current_ace->owner_type = GID_ACE;
1710	current_ace->unix_ug.gid = pst->st_ex_gid;
1711	current_ace->type = SMB_ACL_GROUP_OBJ;
1712
1713	/*
1714	* The Creator Group entry only specifies inheritable permissions,
1715	* never access permissions. WinNT doesn't always set the ACE to
1716	* INHERIT_ONLY, though.
1717	*/
1718	psa->flags \|= SEC_ACE_FLAG_INHERIT_ONLY;
1719
1720	} else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1721	current_ace->owner_type = UID_ACE;
1722	/* If it's the owning user, this is a user_obj, not
1723	* a user. */
1724	if (current_ace->unix_ug.uid == pst->st_ex_uid) {
1725	current_ace->type = SMB_ACL_USER_OBJ;
1726	} else {
1727	current_ace->type = SMB_ACL_USER;
1728	}
1729	} else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1730	current_ace->owner_type = GID_ACE;
1731	/* If it's the primary group, this is a group_obj, not
1732	* a group. */
1733	if (current_ace->unix_ug.gid == pst->st_ex_gid) {
1734	current_ace->type = SMB_ACL_GROUP_OBJ;
1735	} else {
1736	current_ace->type = SMB_ACL_GROUP;
1737	}
1738	} else {
1739	/*
1740	* Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1741	*/
1742
1743	if (non_mappable_sid(&psa->trustee)) {
1744	DEBUG(10, ("create_canon_ace_lists: ignoring "
1745	"non-mappable SID %s\n",
1746	sid_string_dbg(&psa->trustee)));
1747	SAFE_FREE(current_ace);
1748	continue;
1749	}
1750
1751	if (lp_force_unknown_acl_user(SNUM(fsp->conn))) {
1752	DEBUG(10, ("create_canon_ace_lists: ignoring "
1753	"unknown or foreign SID %s\n",
1754	sid_string_dbg(&psa->trustee)));
1755	SAFE_FREE(current_ace);
1756	continue;
1757	}
1758
1759	free_canon_ace_list(file_ace);
1760	free_canon_ace_list(dir_ace);
1761	DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1762	"%s to uid or gid.\n",
1763	sid_string_dbg(&current_ace->trustee)));
1764	SAFE_FREE(current_ace);
1765	return False;
1766	}
1767
1768	/*
1769	* Map the given NT permissions into a UNIX mode_t containing only
1770	* S_I(R\|W\|X)USR bits.
1771	*/
1772
1773	current_ace->perms \|= map_nt_perms( &psa->access_mask, S_IRUSR);
1774	current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1775
1776	/* Store the ace_flag. */
1777	current_ace->ace_flags = psa->flags;
1778
1779	/*
1780	* Now add the created ace to either the file list, the directory
1781	* list, or both. We MUST preserve the order here (hence we use
1782	* DLIST_ADD_END) as NT ACLs are order dependent.
1783	*/
1784
1785	if (fsp->is_directory) {
1786
1787	/*
1788	* We can only add to the default POSIX ACE list if the ACE is
1789	* designed to be inherited by both files and directories.
1790	*/
1791
1792	if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT\|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1793	(SEC_ACE_FLAG_OBJECT_INHERIT\|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1794
1795	DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1796
1797	/*
1798	* Note if this was an allow ace. We can't process
1799	* any further deny ace's after this.
1800	*/
1801
1802	if (current_ace->attr == ALLOW_ACE)
1803	got_dir_allow = True;
1804
1805	if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1806	DEBUG(0,("create_canon_ace_lists: "
1807	"malformed ACL in "
1808	"inheritable ACL! Deny entry "
1809	"after Allow entry. Failing "
1810	"to set on file %s.\n",
1811	fsp_str_dbg(fsp)));
1812	free_canon_ace_list(file_ace);
1813	free_canon_ace_list(dir_ace);
1814	return False;
1815	}
1816
1817	if( DEBUGLVL( 10 )) {
1818	dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1819	print_canon_ace( current_ace, 0);
1820	}
1821
1822	/*
1823	* We have a lossy mapping: directory ACE entries
1824	* CREATOR_OWNER ------\
1825	* (map to) +---> SMB_ACL_USER_OBJ
1826	* owning sid ------/
1827	*
1828	* CREATOR_GROUP ------\
1829	* (map to) +---> SMB_ACL_GROUP_OBJ
1830	* primary group sid --/
1831	*
1832	* on set. And on read of a directory ACL
1833	*
1834	* SMB_ACL_USER_OBJ ----> CREATOR_OWNER
1835	* SMB_ACL_GROUP_OBJ ---> CREATOR_GROUP.
1836	*
1837	* Deal with this on set by duplicating
1838	* owning sid and primary group sid ACE
1839	* entries into the directory ACL.
1840	* Fix from Tsukasa Hamano <hamano@osstech.co.jp>.
1841	*/
1842
1843	if (!dup_owning_ace(dir_ace, current_ace)) {
1844	DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1845	free_canon_ace_list(file_ace);
1846	free_canon_ace_list(dir_ace);
1847	return false;
1848	}
1849
1850	/*
1851	* If this is not an inherit only ACE we need to add a duplicate
1852	* to the file acl.
1853	*/
1854
1855	if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1856	canon_ace *dup_ace = dup_canon_ace(current_ace);
1857
1858	if (!dup_ace) {
1859	DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1860	free_canon_ace_list(file_ace);
1861	free_canon_ace_list(dir_ace);
1862	return False;
1863	}
1864
1865	/*
1866	* We must not free current_ace here as its
1867	* pointer is now owned by the dir_ace list.
1868	*/
1869	current_ace = dup_ace;
1870	/* We've essentially split this ace into two,
1871	* and added the ace with inheritance request
1872	* bits to the directory ACL. Drop those bits for
1873	* the ACE we're adding to the file list. */
1874	current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT\|
1875	SEC_ACE_FLAG_CONTAINER_INHERIT\|
1876	SEC_ACE_FLAG_INHERIT_ONLY);
1877	} else {
1878	/*
1879	* We must not free current_ace here as its
1880	* pointer is now owned by the dir_ace list.
1881	*/
1882	current_ace = NULL;
1883	}
1884	}
1885	}
1886
1887	/*
1888	* Only add to the file ACL if not inherit only.
1889	*/
1890
1891	if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1892	DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1893
1894	/*
1895	* Note if this was an allow ace. We can't process
1896	* any further deny ace's after this.
1897	*/
1898
1899	if (current_ace->attr == ALLOW_ACE)
1900	got_file_allow = True;
1901
1902	if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1903	DEBUG(0,("create_canon_ace_lists: malformed "
1904	"ACL in file ACL ! Deny entry after "
1905	"Allow entry. Failing to set on file "
1906	"%s.\n", fsp_str_dbg(fsp)));
1907	free_canon_ace_list(file_ace);
1908	free_canon_ace_list(dir_ace);
1909	return False;
1910	}
1911
1912	if( DEBUGLVL( 10 )) {
1913	dbgtext("create_canon_ace_lists: adding file ACL:\n");
1914	print_canon_ace( current_ace, 0);
1915	}
1916	all_aces_are_inherit_only = False;
1917	/*
1918	* We must not free current_ace here as its
1919	* pointer is now owned by the file_ace list.
1920	*/
1921	current_ace = NULL;
1922	}
1923
1924	/*
1925	* Free if ACE was not added.
1926	*/
1927
1928	SAFE_FREE(current_ace);
1929	}
1930
1931	if (fsp->is_directory && all_aces_are_inherit_only) {
1932	/*
1933	* Windows 2000 is doing one of these weird 'inherit acl'
1934	* traverses to conserve NTFS ACL resources. Just pretend
1935	* there was no DACL sent. JRA.
1936	*/
1937
1938	DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1939	free_canon_ace_list(file_ace);
1940	free_canon_ace_list(dir_ace);
1941	file_ace = NULL;
1942	dir_ace = NULL;
1943	} else {
1944	/*
1945	* Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in each
1946	* ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1947	* entries can be converted to *_OBJ. Usually we will already have these
1948	* entries in the Default ACL, and the Access ACL will not have them.
1949	*/
1950	if (file_ace) {
1951	check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1952	}
1953	if (dir_ace) {
1954	check_owning_objs(dir_ace, pfile_owner_sid, pfile_grp_sid);
1955	}
1956	}
1957
1958	*ppfile_ace = file_ace;
1959	*ppdir_ace = dir_ace;
1960
1961	return True;
1962	}
1963
1964	/****************************************************************************
1965	ASCII art time again... JRA :-).
1966
1967	We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1968	we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1969	entries). Secondly, the merge code has ensured that all duplicate SID entries for
1970	allow or deny have been merged, so the same SID can only appear once in the deny
1971	list or once in the allow list.
1972
1973	We then process as follows :
1974
1975	---------------------------------------------------------------------------
1976	First pass - look for a Everyone DENY entry.
1977
1978	If it is deny all (rwx) trunate the list at this point.
1979	Else, walk the list from this point and use the deny permissions of this
1980	entry as a mask on all following allow entries. Finally, delete
1981	the Everyone DENY entry (we have applied it to everything possible).
1982
1983	In addition, in this pass we remove any DENY entries that have
1984	no permissions (ie. they are a DENY nothing).
1985	---------------------------------------------------------------------------
1986	Second pass - only deal with deny user entries.
1987
1988	DENY user1 (perms XXX)
1989
1990	new_perms = 0
1991	for all following allow group entries where user1 is in group
1992	new_perms \|= group_perms;
1993
1994	user1 entry perms = new_perms & ~ XXX;
1995
1996	Convert the deny entry to an allow entry with the new perms and
1997	push to the end of the list. Note if the user was in no groups
1998	this maps to a specific allow nothing entry for this user.
1999
2000	The common case from the NT ACL choser (userX deny all) is
2001	optimised so we don't do the group lookup - we just map to
2002	an allow nothing entry.
2003
2004	What we're doing here is inferring the allow permissions the
2005	person setting the ACE on user1 wanted by looking at the allow
2006	permissions on the groups the user is currently in. This will
2007	be a snapshot, depending on group membership but is the best
2008	we can do and has the advantage of failing closed rather than
2009	open.
2010	---------------------------------------------------------------------------
2011	Third pass - only deal with deny group entries.
2012
2013	DENY group1 (perms XXX)
2014
2015	for all following allow user entries where user is in group1
2016	user entry perms = user entry perms & ~ XXX;
2017
2018	If there is a group Everyone allow entry with permissions YYY,
2019	convert the group1 entry to an allow entry and modify its
2020	permissions to be :
2021
2022	new_perms = YYY & ~ XXX
2023
2024	and push to the end of the list.
2025
2026	If there is no group Everyone allow entry then convert the
2027	group1 entry to a allow nothing entry and push to the end of the list.
2028
2029	Note that the common case from the NT ACL choser (groupX deny all)
2030	cannot be optimised here as we need to modify user entries who are
2031	in the group to change them to a deny all also.
2032
2033	What we're doing here is modifying the allow permissions of
2034	user entries (which are more specific in POSIX ACLs) to mask
2035	out the explicit deny set on the group they are in. This will
2036	be a snapshot depending on current group membership but is the
2037	best we can do and has the advantage of failing closed rather
2038	than open.
2039	---------------------------------------------------------------------------
2040	Fourth pass - cope with cumulative permissions.
2041
2042	for all allow user entries, if there exists an allow group entry with
2043	more permissive permissions, and the user is in that group, rewrite the
2044	allow user permissions to contain both sets of permissions.
2045
2046	Currently the code for this is #ifdef'ed out as these semantics make
2047	no sense to me. JRA.
2048	---------------------------------------------------------------------------
2049
2050	Note we MUST do the deny user pass first as this will convert deny user
2051	entries into allow user entries which can then be processed by the deny
2052	group pass.
2053
2054	The above algorithm took a lot of thinking about - hence this
2055	explaination :-). JRA.
2056	****************************************************************************/
2057
2058	/****************************************************************************
2059	Process a canon_ace list entries. This is very complex code. We need
2060	to go through and remove the "deny" permissions from any allow entry that matches
2061	the id of this entry. We have already refused any NT ACL that wasn't in correct
2062	order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2063	we just remove it (to fail safe). We have already removed any duplicate ace
2064	entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2065	allow entries.
2066	****************************************************************************/
2067
2068	static void process_deny_list( canon_ace **pp_ace_list )
2069	{
2070	canon_ace ace_list = pp_ace_list;
2071	canon_ace *curr_ace = NULL;
2072	canon_ace *curr_ace_next = NULL;
2073
2074	/* Pass 1 above - look for an Everyone, deny entry. */
2075
2076	for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2077	canon_ace *allow_ace_p;
2078
2079	curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2080
2081	if (curr_ace->attr != DENY_ACE)
2082	continue;
2083
2084	if (curr_ace->perms == (mode_t)0) {
2085
2086	/* Deny nothing entry - delete. */
2087
2088	DLIST_REMOVE(ace_list, curr_ace);
2089	continue;
2090	}
2091
2092	if (!sid_equal(&curr_ace->trustee, &global_sid_World))
2093	continue;
2094
2095	/* JRATEST - assert. */
2096	SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2097
2098	if (curr_ace->perms == ALL_ACE_PERMS) {
2099
2100	/*
2101	* Optimisation. This is a DENY_ALL to Everyone. Truncate the
2102	* list at this point including this entry.
2103	*/
2104
2105	canon_ace *prev_entry = curr_ace->prev;
2106
2107	free_canon_ace_list( curr_ace );
2108	if (prev_entry)
2109	prev_entry->next = NULL;
2110	else {
2111	/* We deleted the entire list. */
2112	ace_list = NULL;
2113	}
2114	break;
2115	}
2116
2117	for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2118
2119	/*
2120	* Only mask off allow entries.
2121	*/
2122
2123	if (allow_ace_p->attr != ALLOW_ACE)
2124	continue;
2125
2126	allow_ace_p->perms &= ~curr_ace->perms;
2127	}
2128
2129	/*
2130	* Now it's been applied, remove it.
2131	*/
2132
2133	DLIST_REMOVE(ace_list, curr_ace);
2134	}
2135
2136	/* Pass 2 above - deal with deny user entries. */
2137
2138	for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2139	mode_t new_perms = (mode_t)0;
2140	canon_ace *allow_ace_p;
2141
2142	curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2143
2144	if (curr_ace->attr != DENY_ACE)
2145	continue;
2146
2147	if (curr_ace->owner_type != UID_ACE)
2148	continue;
2149
2150	if (curr_ace->perms == ALL_ACE_PERMS) {
2151
2152	/*
2153	* Optimisation - this is a deny everything to this user.
2154	* Convert to an allow nothing and push to the end of the list.
2155	*/
2156
2157	curr_ace->attr = ALLOW_ACE;
2158	curr_ace->perms = (mode_t)0;
2159	DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2160	continue;
2161	}
2162
2163	for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2164
2165	if (allow_ace_p->attr != ALLOW_ACE)
2166	continue;
2167
2168	/* We process GID_ACE and WORLD_ACE entries only. */
2169
2170	if (allow_ace_p->owner_type == UID_ACE)
2171	continue;
2172
2173	if (uid_entry_in_group( curr_ace, allow_ace_p))
2174	new_perms \|= allow_ace_p->perms;
2175	}
2176
2177	/*
2178	* Convert to a allow entry, modify the perms and push to the end
2179	* of the list.
2180	*/
2181
2182	curr_ace->attr = ALLOW_ACE;
2183	curr_ace->perms = (new_perms & ~curr_ace->perms);
2184	DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2185	}
2186
2187	/* Pass 3 above - deal with deny group entries. */
2188
2189	for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2190	canon_ace *allow_ace_p;
2191	canon_ace *allow_everyone_p = NULL;
2192
2193	curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2194
2195	if (curr_ace->attr != DENY_ACE)
2196	continue;
2197
2198	if (curr_ace->owner_type != GID_ACE)
2199	continue;
2200
2201	for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2202
2203	if (allow_ace_p->attr != ALLOW_ACE)
2204	continue;
2205
2206	/* Store a pointer to the Everyone allow, if it exists. */
2207	if (allow_ace_p->owner_type == WORLD_ACE)
2208	allow_everyone_p = allow_ace_p;
2209
2210	/* We process UID_ACE entries only. */
2211
2212	if (allow_ace_p->owner_type != UID_ACE)
2213	continue;
2214
2215	/* Mask off the deny group perms. */
2216
2217	if (uid_entry_in_group( allow_ace_p, curr_ace))
2218	allow_ace_p->perms &= ~curr_ace->perms;
2219	}
2220
2221	/*
2222	* Convert the deny to an allow with the correct perms and
2223	* push to the end of the list.
2224	*/
2225
2226	curr_ace->attr = ALLOW_ACE;
2227	if (allow_everyone_p)
2228	curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2229	else
2230	curr_ace->perms = (mode_t)0;
2231	DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2232	}
2233
2234	/* Doing this fourth pass allows Windows semantics to be layered
2235	* on top of POSIX semantics. I'm not sure if this is desirable.
2236	* For example, in W2K ACLs there is no way to say, "Group X no
2237	* access, user Y full access" if user Y is a member of group X.
2238	* This seems completely broken semantics to me.... JRA.
2239	*/
2240
2241	#if 0
2242	/* Pass 4 above - deal with allow entries. */
2243
2244	for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2245	canon_ace *allow_ace_p;
2246
2247	curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2248
2249	if (curr_ace->attr != ALLOW_ACE)
2250	continue;
2251
2252	if (curr_ace->owner_type != UID_ACE)
2253	continue;
2254
2255	for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2256
2257	if (allow_ace_p->attr != ALLOW_ACE)
2258	continue;
2259
2260	/* We process GID_ACE entries only. */
2261
2262	if (allow_ace_p->owner_type != GID_ACE)
2263	continue;
2264
2265	/* OR in the group perms. */
2266
2267	if (uid_entry_in_group( curr_ace, allow_ace_p))
2268	curr_ace->perms \|= allow_ace_p->perms;
2269	}
2270	}
2271	#endif
2272
2273	*pp_ace_list = ace_list;
2274	}
2275
2276	/****************************************************************************
2277	Create a default mode that will be used if a security descriptor entry has
2278	no user/group/world entries.
2279	****************************************************************************/
2280
2281	static mode_t create_default_mode(files_struct *fsp, bool interitable_mode)
2282	{
2283	int snum = SNUM(fsp->conn);
2284	mode_t and_bits = (mode_t)0;
2285	mode_t or_bits = (mode_t)0;
2286	mode_t mode;
2287
2288	if (interitable_mode) {
2289	mode = unix_mode(fsp->conn, FILE_ATTRIBUTE_ARCHIVE,
2290	fsp->fsp_name, NULL);
2291	} else {
2292	mode = S_IRUSR;
2293	}
2294
2295	if (fsp->is_directory)
2296	mode \|= (S_IWUSR\|S_IXUSR);
2297
2298	/*
2299	* Now AND with the create mode/directory mode bits then OR with the
2300	* force create mode/force directory mode bits.
2301	*/
2302
2303	if (fsp->is_directory) {
2304	and_bits = lp_dir_security_mask(snum);
2305	or_bits = lp_force_dir_security_mode(snum);
2306	} else {
2307	and_bits = lp_security_mask(snum);
2308	or_bits = lp_force_security_mode(snum);
2309	}
2310
2311	return ((mode & and_bits)\|or_bits);
2312	}
2313
2314	/****************************************************************************
2315	Unpack a SEC_DESC into two canonical ace lists. We don't depend on this
2316	succeeding.
2317	****************************************************************************/
2318
2319	static bool unpack_canon_ace(files_struct *fsp,
2320	const SMB_STRUCT_STAT *pst,
2321	DOM_SID *pfile_owner_sid,
2322	DOM_SID *pfile_grp_sid,
2323	canon_ace **ppfile_ace,
2324	canon_ace **ppdir_ace,
2325	uint32 security_info_sent,
2326	const SEC_DESC *psd)
2327	{
2328	SMB_STRUCT_STAT st;
2329	canon_ace *file_ace = NULL;
2330	canon_ace *dir_ace = NULL;
2331
2332	*ppfile_ace = NULL;
2333	*ppdir_ace = NULL;
2334
2335	if(security_info_sent == 0) {
2336	DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2337	return False;
2338	}
2339
2340	/*
2341	* If no DACL then this is a chown only security descriptor.
2342	*/
2343
2344	if(!(security_info_sent & DACL_SECURITY_INFORMATION) \|\| !psd->dacl)
2345	return True;
2346
2347	/*
2348	* Now go through the DACL and create the canon_ace lists.
2349	*/
2350
2351	if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2352	&file_ace, &dir_ace, psd->dacl))
2353	return False;
2354
2355	if ((file_ace == NULL) && (dir_ace == NULL)) {
2356	/* W2K traverse DACL set - ignore. */
2357	return True;
2358	}
2359
2360	/*
2361	* Go through the canon_ace list and merge entries
2362	* belonging to identical users of identical allow or deny type.
2363	* We can do this as all deny entries come first, followed by
2364	* all allow entries (we have mandated this before accepting this acl).
2365	*/
2366
2367	print_canon_ace_list( "file ace - before merge", file_ace);
2368	merge_aces( &file_ace, false);
2369
2370	print_canon_ace_list( "dir ace - before merge", dir_ace);
2371	merge_aces( &dir_ace, true);
2372
2373	/*
2374	* NT ACLs are order dependent. Go through the acl lists and
2375	* process DENY entries by masking the allow entries.
2376	*/
2377
2378	print_canon_ace_list( "file ace - before deny", file_ace);
2379	process_deny_list( &file_ace);
2380
2381	print_canon_ace_list( "dir ace - before deny", dir_ace);
2382	process_deny_list( &dir_ace);
2383
2384	/*
2385	* A well formed POSIX file or default ACL has at least 3 entries, a
2386	* SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2387	* and optionally a mask entry. Ensure this is the case.
2388	*/
2389
2390	print_canon_ace_list( "file ace - before valid", file_ace);
2391
2392	st = *pst;
2393
2394	/*
2395	* A default 3 element mode entry for a file should be r-- --- ---.
2396	* A default 3 element mode entry for a directory should be rwx --- ---.
2397	*/
2398
2399	st.st_ex_mode = create_default_mode(fsp, False);
2400
2401	if (!ensure_canon_entry_valid(&file_ace, fsp->conn->params,
2402	fsp->is_directory, pfile_owner_sid, pfile_grp_sid, &st, True)) {
2403	free_canon_ace_list(file_ace);
2404	free_canon_ace_list(dir_ace);
2405	return False;
2406	}
2407
2408	print_canon_ace_list( "dir ace - before valid", dir_ace);
2409
2410	/*
2411	* A default inheritable 3 element mode entry for a directory should be the
2412	* mode Samba will use to create a file within. Ensure user rwx bits are set if
2413	* it's a directory.
2414	*/
2415
2416	st.st_ex_mode = create_default_mode(fsp, True);
2417
2418	if (dir_ace && !ensure_canon_entry_valid(&dir_ace, fsp->conn->params,
2419	fsp->is_directory, pfile_owner_sid, pfile_grp_sid, &st, True)) {
2420	free_canon_ace_list(file_ace);
2421	free_canon_ace_list(dir_ace);
2422	return False;
2423	}
2424
2425	print_canon_ace_list( "file ace - return", file_ace);
2426	print_canon_ace_list( "dir ace - return", dir_ace);
2427
2428	*ppfile_ace = file_ace;
2429	*ppdir_ace = dir_ace;
2430	return True;
2431
2432	}
2433
2434	/******************************************************************************
2435	When returning permissions, try and fit NT display
2436	semantics if possible. Note the the canon_entries here must have been malloced.
2437	The list format should be - first entry = owner, followed by group and other user
2438	entries, last entry = other.
2439
2440	Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2441	are not ordered, and match on the most specific entry rather than walking a list,
2442	then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2443
2444	Entry 0: owner : deny all except read and write.
2445	Entry 1: owner : allow read and write.
2446	Entry 2: group : deny all except read.
2447	Entry 3: group : allow read.
2448	Entry 4: Everyone : allow read.
2449
2450	But NT cannot display this in their ACL editor !
2451	********************************************************************************/
2452
2453	static void arrange_posix_perms(const char filename, canon_ace *pp_list_head)
2454	{
2455	canon_ace l_head = pp_list_head;
2456	canon_ace *owner_ace = NULL;
2457	canon_ace *other_ace = NULL;
2458	canon_ace *ace = NULL;
2459
2460	for (ace = l_head; ace; ace = ace->next) {
2461	if (ace->type == SMB_ACL_USER_OBJ)
2462	owner_ace = ace;
2463	else if (ace->type == SMB_ACL_OTHER) {
2464	/* Last ace - this is "other" */
2465	other_ace = ace;
2466	}
2467	}
2468
2469	if (!owner_ace \|\| !other_ace) {
2470	DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2471	filename ));
2472	return;
2473	}
2474
2475	/*
2476	* The POSIX algorithm applies to owner first, and other last,
2477	* so ensure they are arranged in this order.
2478	*/
2479
2480	if (owner_ace) {
2481	DLIST_PROMOTE(l_head, owner_ace);
2482	}
2483
2484	if (other_ace) {
2485	DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2486	}
2487
2488	/* We have probably changed the head of the list. */
2489
2490	*pp_list_head = l_head;
2491	}
2492
2493	/****************************************************************************
2494	Create a linked list of canonical ACE entries.
2495	****************************************************************************/
2496
2497	static canon_ace canonicalise_acl(struct connection_struct conn,
2498	const char *fname, SMB_ACL_T posix_acl,
2499	const SMB_STRUCT_STAT *psbuf,
2500	const DOM_SID powner, const DOM_SID pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2501	{
2502	mode_t acl_mask = (S_IRUSR\|S_IWUSR\|S_IXUSR);
2503	canon_ace *l_head = NULL;
2504	canon_ace *ace = NULL;
2505	canon_ace *next_ace = NULL;
2506	int entry_id = SMB_ACL_FIRST_ENTRY;
2507	SMB_ACL_ENTRY_T entry;
2508	size_t ace_count;
2509
2510	while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2511	SMB_ACL_TAG_T tagtype;
2512	SMB_ACL_PERMSET_T permset;
2513	DOM_SID sid;
2514	posix_id unix_ug;
2515	enum ace_owner owner_type;
2516
2517	entry_id = SMB_ACL_NEXT_ENTRY;
2518
2519	/* Is this a MASK entry ? */
2520	if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2521	continue;
2522
2523	if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2524	continue;
2525
2526	/* Decide which SID to use based on the ACL type. */
2527	switch(tagtype) {
2528	case SMB_ACL_USER_OBJ:
2529	/* Get the SID from the owner. */
2530	sid_copy(&sid, powner);
2531	unix_ug.uid = psbuf->st_ex_uid;
2532	owner_type = UID_ACE;
2533	break;
2534	case SMB_ACL_USER:
2535	{
2536	uid_t puid = (uid_t )SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2537	if (puid == NULL) {
2538	DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2539	continue;
2540	}
2541	uid_to_sid( &sid, *puid);
2542	unix_ug.uid = *puid;
2543	owner_type = UID_ACE;
2544	SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2545	break;
2546	}
2547	case SMB_ACL_GROUP_OBJ:
2548	/* Get the SID from the owning group. */
2549	sid_copy(&sid, pgroup);
2550	unix_ug.gid = psbuf->st_ex_gid;
2551	owner_type = GID_ACE;
2552	break;
2553	case SMB_ACL_GROUP:
2554	{
2555	gid_t pgid = (gid_t )SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2556	if (pgid == NULL) {
2557	DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2558	continue;
2559	}
2560	gid_to_sid( &sid, *pgid);
2561	unix_ug.gid = *pgid;
2562	owner_type = GID_ACE;
2563	SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2564	break;
2565	}
2566	case SMB_ACL_MASK:
2567	acl_mask = convert_permset_to_mode_t(conn, permset);
2568	continue; /* Don't count the mask as an entry. */
2569	case SMB_ACL_OTHER:
2570	/* Use the Everyone SID */
2571	sid = global_sid_World;
2572	unix_ug.world = -1;
2573	owner_type = WORLD_ACE;
2574	break;
2575	default:
2576	DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2577	continue;
2578	}
2579
2580	/*
2581	* Add this entry to the list.
2582	*/
2583
2584	if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2585	goto fail;
2586
2587	ZERO_STRUCTP(ace);
2588	ace->type = tagtype;
2589	ace->perms = convert_permset_to_mode_t(conn, permset);
2590	ace->attr = ALLOW_ACE;
2591	ace->trustee = sid;
2592	ace->unix_ug = unix_ug;
2593	ace->owner_type = owner_type;
2594	ace->ace_flags = get_pai_flags(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2595
2596	DLIST_ADD(l_head, ace);
2597	}
2598
2599	/*
2600	* This next call will ensure we have at least a user/group/world set.
2601	*/
2602
2603	if (!ensure_canon_entry_valid(&l_head, conn->params,
2604	S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2605	psbuf, False))
2606	goto fail;
2607
2608	/*
2609	* Now go through the list, masking the permissions with the
2610	* acl_mask. Ensure all DENY Entries are at the start of the list.
2611	*/
2612
2613	DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2614
2615	for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2616	next_ace = ace->next;
2617
2618	/* Masks are only applied to entries other than USER_OBJ and OTHER. */
2619	if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2620	ace->perms &= acl_mask;
2621
2622	if (ace->perms == 0) {
2623	DLIST_PROMOTE(l_head, ace);
2624	}
2625
2626	if( DEBUGLVL( 10 ) ) {
2627	print_canon_ace(ace, ace_count);
2628	}
2629	}
2630
2631	arrange_posix_perms(fname,&l_head );
2632
2633	print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2634
2635	return l_head;
2636
2637	fail:
2638
2639	free_canon_ace_list(l_head);
2640	return NULL;
2641	}
2642
2643	/****************************************************************************
2644	Check if the current user group list contains a given group.
2645	****************************************************************************/
2646
2647	static bool current_user_in_group(gid_t gid)
2648	{
2649	int i;
2650
2651	for (i = 0; i < current_user.ut.ngroups; i++) {
2652	if (current_user.ut.groups[i] == gid) {
2653	return True;
2654	}
2655	}
2656
2657	return False;
2658	}
2659
2660	/****************************************************************************
2661	Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2662	****************************************************************************/
2663
2664	static bool acl_group_override(connection_struct *conn,
2665	const struct smb_filename *smb_fname)
2666	{
2667	if ((errno != EPERM) && (errno != EACCES)) {
2668	return false;
2669	}
2670
2671	/* file primary group == user primary or supplementary group */
2672	if (lp_acl_group_control(SNUM(conn)) &&
2673	current_user_in_group(smb_fname->st.st_ex_gid)) {
2674	return true;
2675	}
2676
2677	/* user has writeable permission */
2678	if (lp_dos_filemode(SNUM(conn)) &&
2679	can_write_to_file(conn, smb_fname)) {
2680	return true;
2681	}
2682
2683	return false;
2684	}
2685
2686	/****************************************************************************
2687	Attempt to apply an ACL to a file or directory.
2688	****************************************************************************/
2689
2690	static bool set_canon_ace_list(files_struct *fsp,
2691	canon_ace *the_ace,
2692	bool default_ace,
2693	const SMB_STRUCT_STAT *psbuf,
2694	bool *pacl_set_support)
2695	{
2696	connection_struct *conn = fsp->conn;
2697	bool ret = False;
2698	SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2699	canon_ace *p_ace;
2700	int i;
2701	SMB_ACL_ENTRY_T mask_entry;
2702	bool got_mask_entry = False;
2703	SMB_ACL_PERMSET_T mask_permset;
2704	SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2705	bool needs_mask = False;
2706	mode_t mask_perms = 0;
2707
2708	/* Use the psbuf that was passed in. */
2709	if (psbuf != &fsp->fsp_name->st) {
2710	fsp->fsp_name->st = *psbuf;
2711	}
2712
2713	#if defined(POSIX_ACL_NEEDS_MASK)
2714	/* HP-UX always wants to have a mask (called "class" there). */
2715	needs_mask = True;
2716	#endif
2717
2718	if (the_acl == NULL) {
2719
2720	if (!no_acl_syscall_error(errno)) {
2721	/*
2722	* Only print this error message if we have some kind of ACL
2723	* support that's not working. Otherwise we would always get this.
2724	*/
2725	DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2726	default_ace ? "default" : "file", strerror(errno) ));
2727	}
2728	*pacl_set_support = False;
2729	goto fail;
2730	}
2731
2732	if( DEBUGLVL( 10 )) {
2733	dbgtext("set_canon_ace_list: setting ACL:\n");
2734	for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2735	print_canon_ace( p_ace, i);
2736	}
2737	}
2738
2739	for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2740	SMB_ACL_ENTRY_T the_entry;
2741	SMB_ACL_PERMSET_T the_permset;
2742
2743	/*
2744	* ACLs only "need" an ACL_MASK entry if there are any named user or
2745	* named group entries. But if there is an ACL_MASK entry, it applies
2746	* to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2747	* so that it doesn't deny (i.e., mask off) any permissions.
2748	*/
2749
2750	if (p_ace->type == SMB_ACL_USER \|\| p_ace->type == SMB_ACL_GROUP) {
2751	needs_mask = True;
2752	mask_perms \|= p_ace->perms;
2753	} else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2754	mask_perms \|= p_ace->perms;
2755	}
2756
2757	/*
2758	* Get the entry for this ACE.
2759	*/
2760
2761	if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2762	DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2763	i, strerror(errno) ));
2764	goto fail;
2765	}
2766
2767	if (p_ace->type == SMB_ACL_MASK) {
2768	mask_entry = the_entry;
2769	got_mask_entry = True;
2770	}
2771
2772	/*
2773	* Ok - we now know the ACL calls should be working, don't
2774	* allow fallback to chmod.
2775	*/
2776
2777	*pacl_set_support = True;
2778
2779	/*
2780	* Initialise the entry from the canon_ace.
2781	*/
2782
2783	/*
2784	* First tell the entry what type of ACE this is.
2785	*/
2786
2787	if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2788	DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2789	i, strerror(errno) ));
2790	goto fail;
2791	}
2792
2793	/*
2794	* Only set the qualifier (user or group id) if the entry is a user
2795	* or group id ACE.
2796	*/
2797
2798	if ((p_ace->type == SMB_ACL_USER) \|\| (p_ace->type == SMB_ACL_GROUP)) {
2799	if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2800	DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2801	i, strerror(errno) ));
2802	goto fail;
2803	}
2804	}
2805
2806	/*
2807	* Convert the mode_t perms in the canon_ace to a POSIX permset.
2808	*/
2809
2810	if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2811	DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2812	i, strerror(errno) ));
2813	goto fail;
2814	}
2815
2816	if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2817	DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2818	(unsigned int)p_ace->perms, i, strerror(errno) ));
2819	goto fail;
2820	}
2821
2822	/*
2823	* ..and apply them to the entry.
2824	*/
2825
2826	if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2827	DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2828	i, strerror(errno) ));
2829	goto fail;
2830	}
2831
2832	if( DEBUGLVL( 10 ))
2833	print_canon_ace( p_ace, i);
2834
2835	}
2836
2837	if (needs_mask && !got_mask_entry) {
2838	if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2839	DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2840	goto fail;
2841	}
2842
2843	if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2844	DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2845	goto fail;
2846	}
2847
2848	if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2849	DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2850	goto fail;
2851	}
2852
2853	if (map_acl_perms_to_permset(conn, S_IRUSR\|S_IWUSR\|S_IXUSR, &mask_permset) == -1) {
2854	DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2855	goto fail;
2856	}
2857
2858	if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2859	DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2860	goto fail;
2861	}
2862	}
2863
2864	/*
2865	* Finally apply it to the file or directory.
2866	*/
2867
2868	if(default_ace \|\| fsp->is_directory \|\| fsp->fh->fd == -1) {
2869	if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
2870	the_acl_type, the_acl) == -1) {
2871	/*
2872	* Some systems allow all the above calls and only fail with no ACL support
2873	* when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2874	*/
2875	if (no_acl_syscall_error(errno)) {
2876	*pacl_set_support = False;
2877	}
2878
2879	if (acl_group_override(conn, fsp->fsp_name)) {
2880	int sret;
2881
2882	DEBUG(5,("set_canon_ace_list: acl group "
2883	"control on and current user in file "
2884	"%s primary group.\n",
2885	fsp_str_dbg(fsp)));
2886
2887	become_root();
2888	sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
2889	fsp->fsp_name->base_name, the_acl_type,
2890	the_acl);
2891	unbecome_root();
2892	if (sret == 0) {
2893	ret = True;
2894	}
2895	}
2896
2897	if (ret == False) {
2898	DEBUG(2,("set_canon_ace_list: "
2899	"sys_acl_set_file type %s failed for "
2900	"file %s (%s).\n",
2901	the_acl_type == SMB_ACL_TYPE_DEFAULT ?
2902	"directory default" : "file",
2903	fsp_str_dbg(fsp), strerror(errno)));
2904	goto fail;
2905	}
2906	}
2907	} else {
2908	if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2909	/*
2910	* Some systems allow all the above calls and only fail with no ACL support
2911	* when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2912	*/
2913	if (no_acl_syscall_error(errno)) {
2914	*pacl_set_support = False;
2915	}
2916
2917	if (acl_group_override(conn, fsp->fsp_name)) {
2918	int sret;
2919
2920	DEBUG(5,("set_canon_ace_list: acl group "
2921	"control on and current user in file "
2922	"%s primary group.\n",
2923	fsp_str_dbg(fsp)));
2924
2925	become_root();
2926	sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2927	unbecome_root();
2928	if (sret == 0) {
2929	ret = True;
2930	}
2931	}
2932
2933	if (ret == False) {
2934	DEBUG(2,("set_canon_ace_list: "
2935	"sys_acl_set_file failed for file %s "
2936	"(%s).\n",
2937	fsp_str_dbg(fsp), strerror(errno)));
2938	goto fail;
2939	}
2940	}
2941	}
2942
2943	ret = True;
2944
2945	fail:
2946
2947	if (the_acl != NULL) {
2948	SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2949	}
2950
2951	return ret;
2952	}
2953
2954	/****************************************************************************
2955	Find a particular canon_ace entry.
2956	****************************************************************************/
2957
2958	static struct canon_ace canon_ace_entry_for(struct canon_ace list, SMB_ACL_TAG_T type, posix_id *id)
2959	{
2960	while (list) {
2961	if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) \|\|
2962	(type == SMB_ACL_USER && id && id->uid == list->unix_ug.uid) \|\|
2963	(type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2964	break;
2965	list = list->next;
2966	}
2967	return list;
2968	}
2969
2970	/****************************************************************************
2971
2972	****************************************************************************/
2973
2974	SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2975	{
2976	SMB_ACL_ENTRY_T entry;
2977
2978	if (!the_acl)
2979	return NULL;
2980	if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2981	SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2982	return NULL;
2983	}
2984	return the_acl;
2985	}
2986
2987	/****************************************************************************
2988	Convert a canon_ace to a generic 3 element permission - if possible.
2989	****************************************************************************/
2990
2991	#define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2992
2993	static bool convert_canon_ace_to_posix_perms( files_struct fsp, canon_ace file_ace_list, mode_t *posix_perms)
2994	{
2995	int snum = SNUM(fsp->conn);
2996	size_t ace_count = count_canon_ace_list(file_ace_list);
2997	canon_ace *ace_p;
2998	canon_ace *owner_ace = NULL;
2999	canon_ace *group_ace = NULL;
3000	canon_ace *other_ace = NULL;
3001	mode_t and_bits;
3002	mode_t or_bits;
3003
3004	if (ace_count != 3) {
3005	DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
3006	"entries for file %s to convert to posix perms.\n",
3007	fsp_str_dbg(fsp)));
3008	return False;
3009	}
3010
3011	for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
3012	if (ace_p->owner_type == UID_ACE)
3013	owner_ace = ace_p;
3014	else if (ace_p->owner_type == GID_ACE)
3015	group_ace = ace_p;
3016	else if (ace_p->owner_type == WORLD_ACE)
3017	other_ace = ace_p;
3018	}
3019
3020	if (!owner_ace \|\| !group_ace \|\| !other_ace) {
3021	DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
3022	"standard entries for file %s.\n", fsp_str_dbg(fsp)));
3023	return False;
3024	}
3025
3026	*posix_perms = (mode_t)0;
3027
3028	*posix_perms \|= owner_ace->perms;
3029	*posix_perms \|= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
3030	*posix_perms \|= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
3031	*posix_perms \|= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
3032	*posix_perms \|= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
3033	*posix_perms \|= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
3034	*posix_perms \|= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
3035
3036	/* The owner must have at least read access. */
3037
3038	*posix_perms \|= S_IRUSR;
3039	if (fsp->is_directory)
3040	*posix_perms \|= (S_IWUSR\|S_IXUSR);
3041
3042	/* If requested apply the masks. */
3043
3044	/* Get the initial bits to apply. */
3045
3046	if (fsp->is_directory) {
3047	and_bits = lp_dir_security_mask(snum);
3048	or_bits = lp_force_dir_security_mode(snum);
3049	} else {
3050	and_bits = lp_security_mask(snum);
3051	or_bits = lp_force_security_mode(snum);
3052	}
3053
3054	posix_perms = (((posix_perms) & and_bits)\|or_bits);
3055
3056	DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
3057	"to perm=0%o for file %s.\n", (int)owner_ace->perms,
3058	(int)group_ace->perms, (int)other_ace->perms,
3059	(int)*posix_perms, fsp_str_dbg(fsp)));
3060
3061	return True;
3062	}
3063
3064	/****************************************************************************
3065	Incoming NT ACLs on a directory can be split into a default POSIX acl (CI\|OI\|IO) and
3066	a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
3067	with CI\|OI set so it is inherited and also applies to the directory.
3068	Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
3069	****************************************************************************/
3070
3071	static size_t merge_default_aces( SEC_ACE *nt_ace_list, size_t num_aces)
3072	{
3073	size_t i, j;
3074
3075	for (i = 0; i < num_aces; i++) {
3076	for (j = i+1; j < num_aces; j++) {
3077	uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3078	uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3079	bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3080	bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3081
3082	/* We know the lower number ACE's are file entries. */
3083	if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3084	(nt_ace_list[i].size == nt_ace_list[j].size) &&
3085	(nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3086	sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3087	(i_inh == j_inh) &&
3088	(i_flags_ni == 0) &&
3089	(j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT\|
3090	SEC_ACE_FLAG_CONTAINER_INHERIT\|
3091	SEC_ACE_FLAG_INHERIT_ONLY))) {
3092	/*
3093	* W2K wants to have access allowed zero access ACE's
3094	* at the end of the list. If the mask is zero, merge
3095	* the non-inherited ACE onto the inherited ACE.
3096	*/
3097
3098	if (nt_ace_list[i].access_mask == 0) {
3099	nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT\|SEC_ACE_FLAG_CONTAINER_INHERIT\|
3100	(i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3101	if (num_aces - i - 1 > 0)
3102	memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3103	sizeof(SEC_ACE));
3104
3105	DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3106	(unsigned int)i, (unsigned int)j ));
3107	} else {
3108	/*
3109	* These are identical except for the flags.
3110	* Merge the inherited ACE onto the non-inherited ACE.
3111	*/
3112
3113	nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT\|SEC_ACE_FLAG_CONTAINER_INHERIT\|
3114	(i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3115	if (num_aces - j - 1 > 0)
3116	memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3117	sizeof(SEC_ACE));
3118
3119	DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3120	(unsigned int)j, (unsigned int)i ));
3121	}
3122	num_aces--;
3123	break;
3124	}
3125	}
3126	}
3127
3128	return num_aces;
3129	}
3130
3131	/*
3132	* Add or Replace ACE entry.
3133	* In some cases we need to add a specific ACE for compatibility reasons.
3134	* When doing that we must make sure we are not actually creating a duplicate
3135	* entry. So we need to search whether an ACE entry already exist and eventually
3136	* replacce the access mask, or add a completely new entry if none was found.
3137	*
3138	* This function assumes the array has enough space to add a new entry without
3139	* any reallocation of memory.
3140	*/
3141
3142	static void add_or_replace_ace(SEC_ACE nt_ace_list, size_t num_aces,
3143	const DOM_SID *sid, enum security_ace_type type,
3144	uint32_t mask, uint8_t flags)
3145	{
3146	int i;
3147
3148	/* first search for a duplicate */
3149	for (i = 0; i < *num_aces; i++) {
3150	if (sid_equal(&nt_ace_list[i].trustee, sid) &&
3151	(nt_ace_list[i].flags == flags)) break;
3152	}
3153
3154	if (i < num_aces) { / found */
3155	nt_ace_list[i].type = type;
3156	nt_ace_list[i].access_mask = mask;
3157	DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3158	i, sid_string_dbg(sid), flags));
3159	return;
3160	}
3161
3162	/* not found, append it */
3163	init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3164	}
3165
3166
3167	/****************************************************************************
3168	Reply to query a security descriptor from an fsp. If it succeeds it allocates
3169	the space for the return elements and returns the size needed to return the
3170	security descriptor. This should be the only external function needed for
3171	the UNIX style get ACL.
3172	****************************************************************************/
3173
3174	static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3175	const char *name,
3176	const SMB_STRUCT_STAT *sbuf,
3177	struct pai_val *pal,
3178	SMB_ACL_T posix_acl,
3179	SMB_ACL_T def_acl,
3180	uint32_t security_info,
3181	SEC_DESC **ppdesc)
3182	{
3183	DOM_SID owner_sid;
3184	DOM_SID group_sid;
3185	size_t sd_size = 0;
3186	SEC_ACL *psa = NULL;
3187	size_t num_acls = 0;
3188	size_t num_def_acls = 0;
3189	size_t num_aces = 0;
3190	canon_ace *file_ace = NULL;
3191	canon_ace *dir_ace = NULL;
3192	SEC_ACE *nt_ace_list = NULL;
3193	size_t num_profile_acls = 0;
3194	DOM_SID orig_owner_sid;
3195	SEC_DESC *psd = NULL;
3196	int i;
3197
3198	/*
3199	* Get the owner, group and world SIDs.
3200	*/
3201
3202	create_file_sids(sbuf, &owner_sid, &group_sid);
3203
3204	if (lp_profile_acls(SNUM(conn))) {
3205	/* For WXP SP1 the owner must be administrators. */
3206	sid_copy(&orig_owner_sid, &owner_sid);
3207	sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3208	sid_copy(&group_sid, &global_sid_Builtin_Users);
3209	num_profile_acls = 3;
3210	}
3211
3212	if ((security_info & DACL_SECURITY_INFORMATION) && !(security_info & PROTECTED_DACL_SECURITY_INFORMATION)) {
3213
3214	/*
3215	* In the optimum case Creator Owner and Creator Group would be used for
3216	* the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3217	* would lead to usability problems under Windows: The Creator entries
3218	* are only available in browse lists of directories and not for files;
3219	* additionally the identity of the owning group couldn't be determined.
3220	* We therefore use those identities only for Default ACLs.
3221	*/
3222
3223	/* Create the canon_ace lists. */
3224	file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3225	&owner_sid, &group_sid, pal,
3226	SMB_ACL_TYPE_ACCESS);
3227
3228	/* We must have some ACLS. */
3229
3230	if (count_canon_ace_list(file_ace) == 0) {
3231	DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3232	goto done;
3233	}
3234
3235	if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3236	dir_ace = canonicalise_acl(conn, name, def_acl,
3237	sbuf,
3238	&global_sid_Creator_Owner,
3239	&global_sid_Creator_Group,
3240	pal, SMB_ACL_TYPE_DEFAULT);
3241	}
3242
3243	/*
3244	* Create the NT ACE list from the canonical ace lists.
3245	*/
3246
3247	{
3248	canon_ace *ace;
3249	enum security_ace_type nt_acl_type;
3250
3251	if (nt4_compatible_acls() && dir_ace) {
3252	/*
3253	* NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3254	* but no non-INHERIT_ONLY entry for one SID. So we only
3255	* remove entries from the Access ACL if the
3256	* corresponding Default ACL entries have also been
3257	* removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3258	* are exceptions. We can do nothing
3259	* intelligent if the Default ACL contains entries that
3260	* are not also contained in the Access ACL, so this
3261	* case will still fail under NT 4.
3262	*/
3263
3264	ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3265	if (ace && !ace->perms) {
3266	DLIST_REMOVE(dir_ace, ace);
3267	SAFE_FREE(ace);
3268
3269	ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3270	if (ace && !ace->perms) {
3271	DLIST_REMOVE(file_ace, ace);
3272	SAFE_FREE(ace);
3273	}
3274	}
3275
3276	/*
3277	* WinNT doesn't usually have Creator Group
3278	* in browse lists, so we send this entry to
3279	* WinNT even if it contains no relevant
3280	* permissions. Once we can add
3281	* Creator Group to browse lists we can
3282	* re-enable this.
3283	*/
3284
3285	#if 0
3286	ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3287	if (ace && !ace->perms) {
3288	DLIST_REMOVE(dir_ace, ace);
3289	SAFE_FREE(ace);
3290	}
3291	#endif
3292
3293	ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3294	if (ace && !ace->perms) {
3295	DLIST_REMOVE(file_ace, ace);
3296	SAFE_FREE(ace);
3297	}
3298	}
3299
3300	num_acls = count_canon_ace_list(file_ace);
3301	num_def_acls = count_canon_ace_list(dir_ace);
3302
3303	/* Allocate the ace list. */
3304	if ((nt_ace_list = SMB_MALLOC_ARRAY(SEC_ACE,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3305	DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3306	goto done;
3307	}
3308
3309	memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(SEC_ACE) );
3310
3311	/*
3312	* Create the NT ACE list from the canonical ace lists.
3313	*/
3314
3315	for (ace = file_ace; ace != NULL; ace = ace->next) {
3316	uint32_t acc = map_canon_ace_perms(SNUM(conn),
3317	&nt_acl_type,
3318	ace->perms,
3319	S_ISDIR(sbuf->st_ex_mode));
3320	init_sec_ace(&nt_ace_list[num_aces++],
3321	&ace->trustee,
3322	nt_acl_type,
3323	acc,
3324	ace->ace_flags);
3325	}
3326
3327	/* The User must have access to a profile share - even
3328	* if we can't map the SID. */
3329	if (lp_profile_acls(SNUM(conn))) {
3330	add_or_replace_ace(nt_ace_list, &num_aces,
3331	&global_sid_Builtin_Users,
3332	SEC_ACE_TYPE_ACCESS_ALLOWED,
3333	FILE_GENERIC_ALL, 0);
3334	}
3335
3336	for (ace = dir_ace; ace != NULL; ace = ace->next) {
3337	uint32_t acc = map_canon_ace_perms(SNUM(conn),
3338	&nt_acl_type,
3339	ace->perms,
3340	S_ISDIR(sbuf->st_ex_mode));
3341	init_sec_ace(&nt_ace_list[num_aces++],
3342	&ace->trustee,
3343	nt_acl_type,
3344	acc,
3345	ace->ace_flags \|
3346	SEC_ACE_FLAG_OBJECT_INHERIT\|
3347	SEC_ACE_FLAG_CONTAINER_INHERIT\|
3348	SEC_ACE_FLAG_INHERIT_ONLY);
3349	}
3350
3351	/* The User must have access to a profile share - even
3352	* if we can't map the SID. */
3353	if (lp_profile_acls(SNUM(conn))) {
3354	add_or_replace_ace(nt_ace_list, &num_aces,
3355	&global_sid_Builtin_Users,
3356	SEC_ACE_TYPE_ACCESS_ALLOWED,
3357	FILE_GENERIC_ALL,
3358	SEC_ACE_FLAG_OBJECT_INHERIT \|
3359	SEC_ACE_FLAG_CONTAINER_INHERIT \|
3360	SEC_ACE_FLAG_INHERIT_ONLY);
3361	}
3362
3363	/*
3364	* Merge POSIX default ACLs and normal ACLs into one NT ACE.
3365	* Win2K needs this to get the inheritance correct when replacing ACLs
3366	* on a directory tree. Based on work by Jim @ IBM.
3367	*/
3368
3369	num_aces = merge_default_aces(nt_ace_list, num_aces);
3370
3371	if (lp_profile_acls(SNUM(conn))) {
3372	for (i = 0; i < num_aces; i++) {
3373	if (sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3374	add_or_replace_ace(nt_ace_list, &num_aces,
3375	&orig_owner_sid,
3376	nt_ace_list[i].type,
3377	nt_ace_list[i].access_mask,
3378	nt_ace_list[i].flags);
3379	break;
3380	}
3381	}
3382	}
3383	}
3384
3385	if (num_aces) {
3386	if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3387	DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3388	goto done;
3389	}
3390	}
3391	} /* security_info & DACL_SECURITY_INFORMATION */
3392
3393	psd = make_standard_sec_desc( talloc_tos(),
3394	(security_info & OWNER_SECURITY_INFORMATION) ? &owner_sid : NULL,
3395	(security_info & GROUP_SECURITY_INFORMATION) ? &group_sid : NULL,
3396	psa,
3397	&sd_size);
3398
3399	if(!psd) {
3400	DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3401	sd_size = 0;
3402	goto done;
3403	}
3404
3405	/*
3406	* Windows 2000: The DACL_PROTECTED flag in the security
3407	* descriptor marks the ACL as non-inheriting, i.e., no
3408	* ACEs from higher level directories propagate to this
3409	* ACL. In the POSIX ACL model permissions are only
3410	* inherited at file create time, so ACLs never contain
3411	* any ACEs that are inherited dynamically. The DACL_PROTECTED
3412	* flag doesn't seem to bother Windows NT.
3413	* Always set this if map acl inherit is turned off.
3414	*/
3415	if (pal == NULL \|\| !lp_map_acl_inherit(SNUM(conn))) {
3416	psd->type \|= SEC_DESC_DACL_PROTECTED;
3417	} else {
3418	psd->type \|= pal->sd_type;
3419	}
3420
3421	if (psd->dacl) {
3422	dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3423	}
3424
3425	*ppdesc = psd;
3426
3427	done:
3428
3429	if (posix_acl) {
3430	SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3431	}
3432	if (def_acl) {
3433	SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3434	}
3435	free_canon_ace_list(file_ace);
3436	free_canon_ace_list(dir_ace);
3437	free_inherited_info(pal);
3438	SAFE_FREE(nt_ace_list);
3439
3440	return NT_STATUS_OK;
3441	}
3442
3443	NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3444	SEC_DESC **ppdesc)
3445	{
3446	SMB_STRUCT_STAT sbuf;
3447	SMB_ACL_T posix_acl = NULL;
3448	struct pai_val *pal;
3449
3450	*ppdesc = NULL;
3451
3452	DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3453	fsp_str_dbg(fsp)));
3454
3455	/* can it happen that fsp_name == NULL ? */
3456	if (fsp->is_directory \|\| fsp->fh->fd == -1) {
3457	return posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3458	security_info, ppdesc);
3459	}
3460
3461	/* Get the stat struct for the owner info. */
3462	if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3463	return map_nt_error_from_unix(errno);
3464	}
3465
3466	/* Get the ACL from the fd. */
3467	posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3468
3469	pal = fload_inherited_info(fsp);
3470
3471	return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3472	&sbuf, pal, posix_acl, NULL,
3473	security_info, ppdesc);
3474	}
3475
3476	NTSTATUS posix_get_nt_acl(struct connection_struct conn, const char name,
3477	uint32_t security_info, SEC_DESC **ppdesc)
3478	{
3479	SMB_ACL_T posix_acl = NULL;
3480	SMB_ACL_T def_acl = NULL;
3481	struct pai_val *pal;
3482	struct smb_filename smb_fname;
3483	int ret;
3484
3485	*ppdesc = NULL;
3486
3487	DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3488
3489	ZERO_STRUCT(smb_fname);
3490	smb_fname.base_name = discard_const_p(char, name);
3491
3492	/* Get the stat struct for the owner info. */
3493	if (lp_posix_pathnames()) {
3494	ret = SMB_VFS_LSTAT(conn, &smb_fname);
3495	} else {
3496	ret = SMB_VFS_STAT(conn, &smb_fname);
3497	}
3498
3499	if (ret == -1) {
3500	return map_nt_error_from_unix(errno);
3501	}
3502
3503	/* Get the ACL from the path. */
3504	posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3505
3506	/* If it's a directory get the default POSIX ACL. */
3507	if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3508	def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3509	def_acl = free_empty_sys_acl(conn, def_acl);
3510	}
3511
3512	pal = load_inherited_info(conn, name);
3513
3514	return posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3515	posix_acl, def_acl, security_info,
3516	ppdesc);
3517	}
3518
3519	/****************************************************************************
3520	Try to chown a file. We will be able to chown it under the following conditions.
3521
3522	1) If we have root privileges, then it will just work.
3523	2) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3524	3) If we have SeRestorePrivilege we can change the user to any other user.
3525	4) If we have write permission to the file and dos_filemodes is set
3526	then allow chown to the currently authenticated user.
3527	****************************************************************************/
3528
3529	int try_chown(connection_struct conn, struct smb_filename smb_fname,
3530	uid_t uid, gid_t gid)
3531	{
3532	int ret;
3533	files_struct *fsp;
3534
3535	if(!CAN_WRITE(conn)) {
3536	return -1;
3537	}
3538
3539	/* Case (1). */
3540	/* try the direct way first */
3541	if (lp_posix_pathnames()) {
3542	ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid, gid);
3543	} else {
3544	ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid, gid);
3545	}
3546
3547	if (ret == 0)
3548	return 0;
3549
3550	/* Case (2) / (3) */
3551	if (lp_enable_privileges()) {
3552
3553	bool has_take_ownership_priv = user_has_privileges(current_user.nt_user_token,
3554	&se_take_ownership);
3555	bool has_restore_priv = user_has_privileges(current_user.nt_user_token,
3556	&se_restore);
3557
3558	/* Case (2) */
3559	if ( ( has_take_ownership_priv && ( uid == current_user.ut.uid ) ) \|\|
3560	/* Case (3) */
3561	( has_restore_priv ) ) {
3562
3563	become_root();
3564	/* Keep the current file gid the same - take ownership doesn't imply group change. */
3565	if (lp_posix_pathnames()) {
3566	ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid,
3567	(gid_t)-1);
3568	} else {
3569	ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid,
3570	(gid_t)-1);
3571	}
3572	unbecome_root();
3573	return ret;
3574	}
3575	}
3576
3577	/* Case (4). */
3578	if (!lp_dos_filemode(SNUM(conn))) {
3579	errno = EPERM;
3580	return -1;
3581	}
3582
3583	/* only allow chown to the current user. This is more secure,
3584	and also copes with the case where the SID in a take ownership ACL is
3585	a local SID on the users workstation
3586	*/
3587	if (uid != current_user.ut.uid) {
3588	errno = EPERM;
3589	return -1;
3590	}
3591
3592	if (lp_posix_pathnames()) {
3593	ret = SMB_VFS_LSTAT(conn, smb_fname);
3594	} else {
3595	ret = SMB_VFS_STAT(conn, smb_fname);
3596	}
3597
3598	if (ret == -1) {
3599	return -1;
3600	}
3601
3602	if (!NT_STATUS_IS_OK(open_file_fchmod(conn, smb_fname, &fsp))) {
3603	return -1;
3604	}
3605
3606	become_root();
3607	/* Keep the current file gid the same. */
3608	if (fsp->fh->fd == -1) {
3609	if (lp_posix_pathnames()) {
3610	ret = SMB_VFS_LCHOWN(conn, smb_fname->base_name, uid,
3611	(gid_t)-1);
3612	} else {
3613	ret = SMB_VFS_CHOWN(conn, smb_fname->base_name, uid,
3614	(gid_t)-1);
3615	}
3616	} else {
3617	ret = SMB_VFS_FCHOWN(fsp, uid, (gid_t)-1);
3618	}
3619	unbecome_root();
3620
3621	close_file(NULL, fsp, NORMAL_CLOSE);
3622
3623	return ret;
3624	}
3625
3626	#if 0
3627	/* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3628
3629	/****************************************************************************
3630	Take care of parent ACL inheritance.
3631	****************************************************************************/
3632
3633	NTSTATUS append_parent_acl(files_struct *fsp,
3634	const SEC_DESC *pcsd,
3635	SEC_DESC **pp_new_sd)
3636	{
3637	struct smb_filename *smb_dname = NULL;
3638	SEC_DESC *parent_sd = NULL;
3639	files_struct *parent_fsp = NULL;
3640	TALLOC_CTX *mem_ctx = talloc_tos();
3641	char *parent_name = NULL;
3642	SEC_ACE *new_ace = NULL;
3643	unsigned int num_aces = pcsd->dacl->num_aces;
3644	NTSTATUS status;
3645	int info;
3646	unsigned int i, j;
3647	SEC_DESC *psd = dup_sec_desc(talloc_tos(), pcsd);
3648	bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3649
3650	if (psd == NULL) {
3651	return NT_STATUS_NO_MEMORY;
3652	}
3653
3654	if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name,
3655	NULL)) {
3656	return NT_STATUS_NO_MEMORY;
3657	}
3658
3659	status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3660	&smb_dname);
3661	if (!NT_STATUS_IS_OK(status)) {
3662	goto fail;
3663	}
3664
3665	status = SMB_VFS_CREATE_FILE(
3666	fsp->conn, /* conn */
3667	NULL, /* req */
3668	0, /* root_dir_fid */
3669	smb_dname, /* fname */
3670	FILE_READ_ATTRIBUTES, /* access_mask */
3671	FILE_SHARE_NONE, /* share_access */
3672	FILE_OPEN, /* create_disposition*/
3673	FILE_DIRECTORY_FILE, /* create_options */
3674	0, /* file_attributes */
3675	INTERNAL_OPEN_ONLY, /* oplock_request */
3676	0, /* allocation_size */
3677	NULL, /* sd */
3678	NULL, /* ea_list */
3679	&parent_fsp, /* result */
3680	&info); /* pinfo */
3681
3682	if (!NT_STATUS_IS_OK(status)) {
3683	TALLOC_FREE(smb_dname);
3684	return status;
3685	}
3686
3687	status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3688	DACL_SECURITY_INFORMATION, &parent_sd );
3689
3690	close_file(NULL, parent_fsp, NORMAL_CLOSE);
3691	TALLOC_FREE(smb_dname);
3692
3693	if (!NT_STATUS_IS_OK(status)) {
3694	return status;
3695	}
3696
3697	/*
3698	* Make room for potentially all the ACLs from
3699	* the parent. We used to add the ugw triple here,
3700	* as we knew we were dealing with POSIX ACLs.
3701	* We no longer need to do so as we can guarentee
3702	* that a default ACL from the parent directory will
3703	* be well formed for POSIX ACLs if it came from a
3704	* POSIX ACL source, and if we're not writing to a
3705	* POSIX ACL sink then we don't care if it's not well
3706	* formed. JRA.
3707	*/
3708
3709	num_aces += parent_sd->dacl->num_aces;
3710
3711	if((new_ace = TALLOC_ZERO_ARRAY(mem_ctx, SEC_ACE,
3712	num_aces)) == NULL) {
3713	return NT_STATUS_NO_MEMORY;
3714	}
3715
3716	/* Start by copying in all the given ACE entries. */
3717	for (i = 0; i < psd->dacl->num_aces; i++) {
3718	sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3719	}
3720
3721	/*
3722	* Note that we're ignoring "inherit permissions" here
3723	* as that really only applies to newly created files. JRA.
3724	*/
3725
3726	/* Finally append any inherited ACEs. */
3727	for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3728	SEC_ACE *se = &parent_sd->dacl->aces[j];
3729
3730	if (fsp->is_directory) {
3731	if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3732	/* Doesn't apply to a directory - ignore. */
3733	DEBUG(10,("append_parent_acl: directory %s "
3734	"ignoring non container "
3735	"inherit flags %u on ACE with sid %s "
3736	"from parent %s\n",
3737	fsp_str_dbg(fsp),
3738	(unsigned int)se->flags,
3739	sid_string_dbg(&se->trustee),
3740	parent_name));
3741	continue;
3742	}
3743	} else {
3744	if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3745	/* Doesn't apply to a file - ignore. */
3746	DEBUG(10,("append_parent_acl: file %s "
3747	"ignoring non object "
3748	"inherit flags %u on ACE with sid %s "
3749	"from parent %s\n",
3750	fsp_str_dbg(fsp),
3751	(unsigned int)se->flags,
3752	sid_string_dbg(&se->trustee),
3753	parent_name));
3754	continue;
3755	}
3756	}
3757
3758	if (is_dacl_protected) {
3759	/* If the DACL is protected it means we must
3760	* not overwrite an existing ACE entry with the
3761	* same SID. This is order N^2. Ouch :-(. JRA. */
3762	unsigned int k;
3763	for (k = 0; k < psd->dacl->num_aces; k++) {
3764	if (sid_equal(&psd->dacl->aces[k].trustee,
3765	&se->trustee)) {
3766	break;
3767	}
3768	}
3769	if (k < psd->dacl->num_aces) {
3770	/* SID matched. Ignore. */
3771	DEBUG(10,("append_parent_acl: path %s "
3772	"ignoring ACE with protected sid %s "
3773	"from parent %s\n",
3774	fsp_str_dbg(fsp),
3775	sid_string_dbg(&se->trustee),
3776	parent_name));
3777	continue;
3778	}
3779	}
3780
3781	sec_ace_copy(&new_ace[i], se);
3782	if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3783	new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3784	}
3785	new_ace[i].flags \|= SEC_ACE_FLAG_INHERITED_ACE;
3786
3787	if (fsp->is_directory) {
3788	/*
3789	* Strip off any inherit only. It's applied.
3790	*/
3791	new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3792	if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3793	/* No further inheritance. */
3794	new_ace[i].flags &=
3795	~(SEC_ACE_FLAG_CONTAINER_INHERIT\|
3796	SEC_ACE_FLAG_OBJECT_INHERIT);
3797	}
3798	} else {
3799	/*
3800	* Strip off any container or inherit
3801	* flags, they can't apply to objects.
3802	*/
3803	new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT\|
3804	SEC_ACE_FLAG_INHERIT_ONLY\|
3805	SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3806	}
3807	i++;
3808
3809	DEBUG(10,("append_parent_acl: path %s "
3810	"inheriting ACE with sid %s "
3811	"from parent %s\n",
3812	fsp_str_dbg(fsp),
3813	sid_string_dbg(&se->trustee),
3814	parent_name));
3815	}
3816
3817	psd->dacl->aces = new_ace;
3818	psd->dacl->num_aces = i;
3819	psd->type &= ~(SE_DESC_DACL_AUTO_INHERITED\|
3820	SE_DESC_DACL_AUTO_INHERIT_REQ);
3821
3822	*pp_new_sd = psd;
3823	return status;
3824	}
3825	#endif
3826
3827	/****************************************************************************
3828	Reply to set a security descriptor on an fsp. security_info_sent is the
3829	description of the following NT ACL.
3830	This should be the only external function needed for the UNIX style set ACL.
3831	****************************************************************************/
3832
3833	NTSTATUS set_nt_acl(files_struct fsp, uint32 security_info_sent, const SEC_DESC psd_orig)
3834	{
3835	connection_struct *conn = fsp->conn;
3836	uid_t user = (uid_t)-1;
3837	gid_t grp = (gid_t)-1;
3838	DOM_SID file_owner_sid;
3839	DOM_SID file_grp_sid;
3840	canon_ace *file_ace_list = NULL;
3841	canon_ace *dir_ace_list = NULL;
3842	bool acl_perms = False;
3843	mode_t orig_mode = (mode_t)0;
3844	NTSTATUS status;
3845	bool set_acl_as_root = false;
3846	bool acl_set_support = false;
3847	bool ret = false;
3848	SEC_DESC *psd = NULL;
3849
3850	DEBUG(10,("set_nt_acl: called for file %s\n",
3851	fsp_str_dbg(fsp)));
3852
3853	if (!CAN_WRITE(conn)) {
3854	DEBUG(10,("set acl rejected on read-only share\n"));
3855	return NT_STATUS_MEDIA_WRITE_PROTECTED;
3856	}
3857
3858	if (!psd_orig) {
3859	return NT_STATUS_INVALID_PARAMETER;
3860	}
3861
3862	psd = dup_sec_desc(talloc_tos(), psd_orig);
3863	if (!psd) {
3864	return NT_STATUS_NO_MEMORY;
3865	}
3866
3867	/*
3868	* Get the current state of the file.
3869	*/
3870
3871	status = vfs_stat_fsp(fsp);
3872	if (!NT_STATUS_IS_OK(status)) {
3873	return status;
3874	}
3875
3876	/* Save the original element we check against. */
3877	orig_mode = fsp->fsp_name->st.st_ex_mode;
3878
3879	/*
3880	* Unpack the user/group/world id's.
3881	*/
3882
3883	/* POSIX can't cope with missing owner/group. */
3884	if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) {
3885	security_info_sent &= ~SECINFO_OWNER;
3886	}
3887	if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) {
3888	security_info_sent &= ~SECINFO_GROUP;
3889	}
3890
3891	status = unpack_nt_owners( SNUM(conn), &user, &grp, security_info_sent, psd);
3892	if (!NT_STATUS_IS_OK(status)) {
3893	return status;
3894	}
3895
3896	/*
3897	* Do we need to chown ? If so this must be done first as the incoming
3898	* CREATOR_OWNER acl will be relative to the new owner, not the old.
3899	* Noticed by Simo.
3900	*/
3901
3902	if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) \|\|
3903	(( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3904
3905	DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3906	fsp_str_dbg(fsp), (unsigned int)user,
3907	(unsigned int)grp));
3908
3909	if(try_chown(fsp->conn, fsp->fsp_name, user, grp) == -1) {
3910	DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3911	"= %s.\n", fsp_str_dbg(fsp),
3912	(unsigned int)user, (unsigned int)grp,
3913	strerror(errno)));
3914	if (errno == EPERM) {
3915	return NT_STATUS_INVALID_OWNER;
3916	}
3917	return map_nt_error_from_unix(errno);
3918	}
3919
3920	/*
3921	* Recheck the current state of the file, which may have changed.
3922	* (suid/sgid bits, for instance)
3923	*/
3924
3925	status = vfs_stat_fsp(fsp);
3926	if (!NT_STATUS_IS_OK(status)) {
3927	return status;
3928	}
3929
3930	/* Save the original element we check against. */
3931	orig_mode = fsp->fsp_name->st.st_ex_mode;
3932
3933	/* If we successfully chowned, we know we must
3934	* be able to set the acl, so do it as root.
3935	*/
3936	set_acl_as_root = true;
3937	}
3938
3939	create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3940
3941	if((security_info_sent & SECINFO_DACL) &&
3942	(psd->type & SEC_DESC_DACL_PRESENT) &&
3943	(psd->dacl == NULL)) {
3944	SEC_ACE ace[3];
3945
3946	/* We can't have NULL DACL in POSIX.
3947	Use owner/group/Everyone -> full access. */
3948
3949	init_sec_ace(&ace[0],
3950	&file_owner_sid,
3951	SEC_ACE_TYPE_ACCESS_ALLOWED,
3952	GENERIC_ALL_ACCESS,
3953	0);
3954	init_sec_ace(&ace[1],
3955	&file_grp_sid,
3956	SEC_ACE_TYPE_ACCESS_ALLOWED,
3957	GENERIC_ALL_ACCESS,
3958	0);
3959	init_sec_ace(&ace[2],
3960	&global_sid_World,
3961	SEC_ACE_TYPE_ACCESS_ALLOWED,
3962	GENERIC_ALL_ACCESS,
3963	0);
3964	psd->dacl = make_sec_acl(talloc_tos(),
3965	NT4_ACL_REVISION,
3966	3,
3967	ace);
3968	if (psd->dacl == NULL) {
3969	return NT_STATUS_NO_MEMORY;
3970	}
3971	security_acl_map_generic(psd->dacl, &file_generic_mapping);
3972	}
3973
3974	acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
3975	&file_grp_sid, &file_ace_list,
3976	&dir_ace_list, security_info_sent, psd);
3977
3978	/* Ignore W2K traverse DACL set. */
3979	if (!file_ace_list && !dir_ace_list) {
3980	return NT_STATUS_OK;
3981	}
3982
3983	if (!acl_perms) {
3984	DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3985	free_canon_ace_list(file_ace_list);
3986	free_canon_ace_list(dir_ace_list);
3987	return NT_STATUS_ACCESS_DENIED;
3988	}
3989
3990	/*
3991	* Only change security if we got a DACL.
3992	*/
3993
3994	if(!(security_info_sent & DACL_SECURITY_INFORMATION) \|\| (psd->dacl == NULL)) {
3995	free_canon_ace_list(file_ace_list);
3996	free_canon_ace_list(dir_ace_list);
3997	return NT_STATUS_OK;
3998	}
3999
4000	/*
4001	* Try using the POSIX ACL set first. Fall back to chmod if
4002	* we have no ACL support on this filesystem.
4003	*/
4004
4005	if (acl_perms && file_ace_list) {
4006	if (set_acl_as_root) {
4007	become_root();
4008	}
4009	ret = set_canon_ace_list(fsp, file_ace_list, false,
4010	&fsp->fsp_name->st, &acl_set_support);
4011	if (set_acl_as_root) {
4012	unbecome_root();
4013	}
4014	if (acl_set_support && ret == false) {
4015	DEBUG(3,("set_nt_acl: failed to set file acl on file "
4016	"%s (%s).\n", fsp_str_dbg(fsp),
4017	strerror(errno)));
4018	free_canon_ace_list(file_ace_list);
4019	free_canon_ace_list(dir_ace_list);
4020	return map_nt_error_from_unix(errno);
4021	}
4022	}
4023
4024	if (acl_perms && acl_set_support && fsp->is_directory) {
4025	if (dir_ace_list) {
4026	if (set_acl_as_root) {
4027	become_root();
4028	}
4029	ret = set_canon_ace_list(fsp, dir_ace_list, true,
4030	&fsp->fsp_name->st,
4031	&acl_set_support);
4032	if (set_acl_as_root) {
4033	unbecome_root();
4034	}
4035	if (ret == false) {
4036	DEBUG(3,("set_nt_acl: failed to set default "
4037	"acl on directory %s (%s).\n",
4038	fsp_str_dbg(fsp), strerror(errno)));
4039	free_canon_ace_list(file_ace_list);
4040	free_canon_ace_list(dir_ace_list);
4041	return map_nt_error_from_unix(errno);
4042	}
4043	} else {
4044	int sret = -1;
4045
4046	/*
4047	* No default ACL - delete one if it exists.
4048	*/
4049
4050	if (set_acl_as_root) {
4051	become_root();
4052	}
4053	sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
4054	fsp->fsp_name->base_name);
4055	if (set_acl_as_root) {
4056	unbecome_root();
4057	}
4058	if (sret == -1) {
4059	if (acl_group_override(conn, fsp->fsp_name)) {
4060	DEBUG(5,("set_nt_acl: acl group "
4061	"control on and current user "
4062	"in file %s primary group. "
4063	"Override delete_def_acl\n",
4064	fsp_str_dbg(fsp)));
4065
4066	become_root();
4067	sret =
4068	SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
4069	conn,
4070	fsp->fsp_name->base_name);
4071	unbecome_root();
4072	}
4073
4074	if (sret == -1) {
4075	DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
4076	free_canon_ace_list(file_ace_list);
4077	free_canon_ace_list(dir_ace_list);
4078	return map_nt_error_from_unix(errno);
4079	}
4080	}
4081	}
4082	}
4083
4084	if (acl_set_support) {
4085	if (set_acl_as_root) {
4086	become_root();
4087	}
4088	store_inheritance_attributes(fsp,
4089	file_ace_list,
4090	dir_ace_list,
4091	psd->type);
4092	if (set_acl_as_root) {
4093	unbecome_root();
4094	}
4095	}
4096
4097	/*
4098	* If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
4099	*/
4100
4101	if(!acl_set_support && acl_perms) {
4102	mode_t posix_perms;
4103
4104	if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
4105	free_canon_ace_list(file_ace_list);
4106	free_canon_ace_list(dir_ace_list);
4107	DEBUG(3,("set_nt_acl: failed to convert file acl to "
4108	"posix permissions for file %s.\n",
4109	fsp_str_dbg(fsp)));
4110	return NT_STATUS_ACCESS_DENIED;
4111	}
4112
4113	if (orig_mode != posix_perms) {
4114	int sret = -1;
4115
4116	DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
4117	fsp_str_dbg(fsp), (unsigned int)posix_perms));
4118
4119	if (set_acl_as_root) {
4120	become_root();
4121	}
4122	sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
4123	posix_perms);
4124	if (set_acl_as_root) {
4125	unbecome_root();
4126	}
4127	if(sret == -1) {
4128	if (acl_group_override(conn, fsp->fsp_name)) {
4129	DEBUG(5,("set_nt_acl: acl group "
4130	"control on and current user "
4131	"in file %s primary group. "
4132	"Override chmod\n",
4133	fsp_str_dbg(fsp)));
4134
4135	become_root();
4136	sret = SMB_VFS_CHMOD(conn,
4137	fsp->fsp_name->base_name,
4138	posix_perms);
4139	unbecome_root();
4140	}
4141
4142	if (sret == -1) {
4143	DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4144	"failed. Error = %s.\n",
4145	fsp_str_dbg(fsp),
4146	(unsigned int)posix_perms,
4147	strerror(errno)));
4148	free_canon_ace_list(file_ace_list);
4149	free_canon_ace_list(dir_ace_list);
4150	return map_nt_error_from_unix(errno);
4151	}
4152	}
4153	}
4154	}
4155
4156	free_canon_ace_list(file_ace_list);
4157	free_canon_ace_list(dir_ace_list);
4158
4159	/* Ensure the stat struct in the fsp is correct. */
4160	status = vfs_stat_fsp(fsp);
4161
4162	return NT_STATUS_OK;
4163	}
4164
4165	/****************************************************************************
4166	Get the actual group bits stored on a file with an ACL. Has no effect if
4167	the file has no ACL. Needed in dosmode code where the stat() will return
4168	the mask bits, not the real group bits, for a file with an ACL.
4169	****************************************************************************/
4170
4171	int get_acl_group_bits( connection_struct conn, const char fname, mode_t *mode )
4172	{
4173	int entry_id = SMB_ACL_FIRST_ENTRY;
4174	SMB_ACL_ENTRY_T entry;
4175	SMB_ACL_T posix_acl;
4176	int result = -1;
4177
4178	posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
4179	if (posix_acl == (SMB_ACL_T)NULL)
4180	return -1;
4181
4182	while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4183	SMB_ACL_TAG_T tagtype;
4184	SMB_ACL_PERMSET_T permset;
4185
4186	entry_id = SMB_ACL_NEXT_ENTRY;
4187
4188	if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
4189	break;
4190
4191	if (tagtype == SMB_ACL_GROUP_OBJ) {
4192	if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4193	break;
4194	} else {
4195	*mode &= ~(S_IRGRP\|S_IWGRP\|S_IXGRP);
4196	*mode \|= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
4197	*mode \|= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4198	*mode \|= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4199	result = 0;
4200	break;
4201	}
4202	}
4203	}
4204	SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4205	return result;
4206	}
4207
4208	/****************************************************************************
4209	Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4210	and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4211	****************************************************************************/
4212
4213	static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4214	{
4215	int entry_id = SMB_ACL_FIRST_ENTRY;
4216	SMB_ACL_ENTRY_T entry;
4217	int num_entries = 0;
4218
4219	while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4220	SMB_ACL_TAG_T tagtype;
4221	SMB_ACL_PERMSET_T permset;
4222	mode_t perms;
4223
4224	entry_id = SMB_ACL_NEXT_ENTRY;
4225
4226	if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
4227	return -1;
4228
4229	if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
4230	return -1;
4231
4232	num_entries++;
4233
4234	switch(tagtype) {
4235	case SMB_ACL_USER_OBJ:
4236	perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4237	break;
4238	case SMB_ACL_GROUP_OBJ:
4239	perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4240	break;
4241	case SMB_ACL_MASK:
4242	/*
4243	* FIXME: The ACL_MASK entry permissions should really be set to
4244	* the union of the permissions of all ACL_USER,
4245	* ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4246	* acl_calc_mask() does, but Samba ACLs doesn't provide it.
4247	*/
4248	perms = S_IRUSR\|S_IWUSR\|S_IXUSR;
4249	break;
4250	case SMB_ACL_OTHER:
4251	perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4252	break;
4253	default:
4254	continue;
4255	}
4256
4257	if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4258	return -1;
4259
4260	if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
4261	return -1;
4262	}
4263
4264	/*
4265	* If this is a simple 3 element ACL or no elements then it's a standard
4266	* UNIX permission set. Just use chmod...
4267	*/
4268
4269	if ((num_entries == 3) \|\| (num_entries == 0))
4270	return -1;
4271
4272	return 0;
4273	}
4274
4275	/****************************************************************************
4276	Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4277	GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4278	resulting ACL on TO. Note that name is in UNIX character set.
4279	****************************************************************************/
4280
4281	static int copy_access_posix_acl(connection_struct conn, const char from, const char *to, mode_t mode)
4282	{
4283	SMB_ACL_T posix_acl = NULL;
4284	int ret = -1;
4285
4286	if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4287	return -1;
4288
4289	if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4290	goto done;
4291
4292	ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4293
4294	done:
4295
4296	SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4297	return ret;
4298	}
4299
4300	/****************************************************************************
4301	Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4302	and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4303	Note that name is in UNIX character set.
4304	****************************************************************************/
4305
4306	int chmod_acl(connection_struct conn, const char name, mode_t mode)
4307	{
4308	return copy_access_posix_acl(conn, name, name, mode);
4309	}
4310
4311	/****************************************************************************
4312	Check for an existing default POSIX ACL on a directory.
4313	****************************************************************************/
4314
4315	static bool directory_has_default_posix_acl(connection_struct conn, const char fname)
4316	{
4317	SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4318	bool has_acl = False;
4319	SMB_ACL_ENTRY_T entry;
4320
4321	if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4322	has_acl = True;
4323	}
4324
4325	if (def_acl) {
4326	SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4327	}
4328	return has_acl;
4329	}
4330
4331	/****************************************************************************
4332	If the parent directory has no default ACL but it does have an Access ACL,
4333	inherit this Access ACL to file name.
4334	****************************************************************************/
4335
4336	int inherit_access_posix_acl(connection_struct conn, const char inherit_from_dir,
4337	const char *name, mode_t mode)
4338	{
4339	if (directory_has_default_posix_acl(conn, inherit_from_dir))
4340	return 0;
4341
4342	return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4343	}
4344
4345	/****************************************************************************
4346	Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4347	and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4348	****************************************************************************/
4349
4350	int fchmod_acl(files_struct *fsp, mode_t mode)
4351	{
4352	connection_struct *conn = fsp->conn;
4353	SMB_ACL_T posix_acl = NULL;
4354	int ret = -1;
4355
4356	if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4357	return -1;
4358
4359	if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4360	goto done;
4361
4362	ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4363
4364	done:
4365
4366	SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4367	return ret;
4368	}
4369
4370	/****************************************************************************
4371	Map from wire type to permset.
4372	****************************************************************************/
4373
4374	static bool unix_ex_wire_to_permset(connection_struct conn, unsigned char wire_perm, SMB_ACL_PERMSET_T p_permset)
4375	{
4376	if (wire_perm & ~(SMB_POSIX_ACL_READ\|SMB_POSIX_ACL_WRITE\|SMB_POSIX_ACL_EXECUTE)) {
4377	return False;
4378	}
4379
4380	if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1) {
4381	return False;
4382	}
4383
4384	if (wire_perm & SMB_POSIX_ACL_READ) {
4385	if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
4386	return False;
4387	}
4388	}
4389	if (wire_perm & SMB_POSIX_ACL_WRITE) {
4390	if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
4391	return False;
4392	}
4393	}
4394	if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4395	if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
4396	return False;
4397	}
4398	}
4399	return True;
4400	}
4401
4402	/****************************************************************************
4403	Map from wire type to tagtype.
4404	****************************************************************************/
4405
4406	static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4407	{
4408	switch (wire_tt) {
4409	case SMB_POSIX_ACL_USER_OBJ:
4410	*p_tt = SMB_ACL_USER_OBJ;
4411	break;
4412	case SMB_POSIX_ACL_USER:
4413	*p_tt = SMB_ACL_USER;
4414	break;
4415	case SMB_POSIX_ACL_GROUP_OBJ:
4416	*p_tt = SMB_ACL_GROUP_OBJ;
4417	break;
4418	case SMB_POSIX_ACL_GROUP:
4419	*p_tt = SMB_ACL_GROUP;
4420	break;
4421	case SMB_POSIX_ACL_MASK:
4422	*p_tt = SMB_ACL_MASK;
4423	break;
4424	case SMB_POSIX_ACL_OTHER:
4425	*p_tt = SMB_ACL_OTHER;
4426	break;
4427	default:
4428	return False;
4429	}
4430	return True;
4431	}
4432
4433	/****************************************************************************
4434	Create a new POSIX acl from wire permissions.
4435	FIXME ! How does the share mask/mode fit into this.... ?
4436	****************************************************************************/
4437
4438	static SMB_ACL_T create_posix_acl_from_wire(connection_struct conn, uint16 num_acls, const char pdata)
4439	{
4440	unsigned int i;
4441	SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4442
4443	if (the_acl == NULL) {
4444	return NULL;
4445	}
4446
4447	for (i = 0; i < num_acls; i++) {
4448	SMB_ACL_ENTRY_T the_entry;
4449	SMB_ACL_PERMSET_T the_permset;
4450	SMB_ACL_TAG_T tag_type;
4451
4452	if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4453	DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4454	i, strerror(errno) ));
4455	goto fail;
4456	}
4457
4458	if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4459	DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4460	CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4461	goto fail;
4462	}
4463
4464	if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4465	DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4466	i, strerror(errno) ));
4467	goto fail;
4468	}
4469
4470	/* Get the permset pointer from the new ACL entry. */
4471	if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4472	DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4473	i, strerror(errno) ));
4474	goto fail;
4475	}
4476
4477	/* Map from wire to permissions. */
4478	if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4479	DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4480	CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4481	goto fail;
4482	}
4483
4484	/* Now apply to the new ACL entry. */
4485	if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4486	DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4487	i, strerror(errno) ));
4488	goto fail;
4489	}
4490
4491	if (tag_type == SMB_ACL_USER) {
4492	uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4493	uid_t uid = (uid_t)uidval;
4494	if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4495	DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4496	(unsigned int)uid, i, strerror(errno) ));
4497	goto fail;
4498	}
4499	}
4500
4501	if (tag_type == SMB_ACL_GROUP) {
4502	uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4503	gid_t gid = (uid_t)gidval;
4504	if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4505	DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4506	(unsigned int)gid, i, strerror(errno) ));
4507	goto fail;
4508	}
4509	}
4510	}
4511
4512	return the_acl;
4513
4514	fail:
4515
4516	if (the_acl != NULL) {
4517	SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4518	}
4519	return NULL;
4520	}
4521
4522	/****************************************************************************
4523	Calls from UNIX extensions - Default POSIX ACL set.
4524	If num_def_acls == 0 and not a directory just return. If it is a directory
4525	and num_def_acls == 0 then remove the default acl. Else set the default acl
4526	on the directory.
4527	****************************************************************************/
4528
4529	bool set_unix_posix_default_acl(connection_struct conn, const char fname, const SMB_STRUCT_STAT *psbuf,
4530	uint16 num_def_acls, const char *pdata)
4531	{
4532	SMB_ACL_T def_acl = NULL;
4533
4534	if (!S_ISDIR(psbuf->st_ex_mode)) {
4535	if (num_def_acls) {
4536	DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4537	errno = EISDIR;
4538	return False;
4539	} else {
4540	return True;
4541	}
4542	}
4543
4544	if (!num_def_acls) {
4545	/* Remove the default ACL. */
4546	if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4547	DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4548	fname, strerror(errno) ));
4549	return False;
4550	}
4551	return True;
4552	}
4553
4554	if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4555	return False;
4556	}
4557
4558	if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4559	DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4560	fname, strerror(errno) ));
4561	SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4562	return False;
4563	}
4564
4565	DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4566	SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4567	return True;
4568	}
4569
4570	/****************************************************************************
4571	Remove an ACL from a file. As we don't have acl_delete_entry() available
4572	we must read the current acl and copy all entries except MASK, USER and GROUP
4573	to a new acl, then set that. This (at least on Linux) causes any ACL to be
4574	removed.
4575	FIXME ! How does the share mask/mode fit into this.... ?
4576	****************************************************************************/
4577
4578	static bool remove_posix_acl(connection_struct conn, files_struct fsp, const char *fname)
4579	{
4580	SMB_ACL_T file_acl = NULL;
4581	int entry_id = SMB_ACL_FIRST_ENTRY;
4582	SMB_ACL_ENTRY_T entry;
4583	bool ret = False;
4584	/* Create a new ACL with only 3 entries, u/g/w. */
4585	SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4586	SMB_ACL_ENTRY_T user_ent = NULL;
4587	SMB_ACL_ENTRY_T group_ent = NULL;
4588	SMB_ACL_ENTRY_T other_ent = NULL;
4589
4590	if (new_file_acl == NULL) {
4591	DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4592	return False;
4593	}
4594
4595	/* Now create the u/g/w entries. */
4596	if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4597	DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4598	fname, strerror(errno) ));
4599	goto done;
4600	}
4601	if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4602	DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4603	fname, strerror(errno) ));
4604	goto done;
4605	}
4606
4607	if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4608	DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4609	fname, strerror(errno) ));
4610	goto done;
4611	}
4612	if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4613	DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4614	fname, strerror(errno) ));
4615	goto done;
4616	}
4617
4618	if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4619	DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4620	fname, strerror(errno) ));
4621	goto done;
4622	}
4623	if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4624	DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4625	fname, strerror(errno) ));
4626	goto done;
4627	}
4628
4629	/* Get the current file ACL. */
4630	if (fsp && fsp->fh->fd != -1) {
4631	file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4632	} else {
4633	file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4634	}
4635
4636	if (file_acl == NULL) {
4637	/* This is only returned if an error occurred. Even for a file with
4638	no acl a u/g/w acl should be returned. */
4639	DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4640	fname, strerror(errno) ));
4641	goto done;
4642	}
4643
4644	while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4645	SMB_ACL_TAG_T tagtype;
4646	SMB_ACL_PERMSET_T permset;
4647
4648	entry_id = SMB_ACL_NEXT_ENTRY;
4649
4650	if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4651	DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4652	fname, strerror(errno) ));
4653	goto done;
4654	}
4655
4656	if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4657	DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4658	fname, strerror(errno) ));
4659	goto done;
4660	}
4661
4662	if (tagtype == SMB_ACL_USER_OBJ) {
4663	if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4664	DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4665	fname, strerror(errno) ));
4666	}
4667	} else if (tagtype == SMB_ACL_GROUP_OBJ) {
4668	if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4669	DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4670	fname, strerror(errno) ));
4671	}
4672	} else if (tagtype == SMB_ACL_OTHER) {
4673	if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4674	DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4675	fname, strerror(errno) ));
4676	}
4677	}
4678	}
4679
4680	/* Set the new empty file ACL. */
4681	if (fsp && fsp->fh->fd != -1) {
4682	if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4683	DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4684	fname, strerror(errno) ));
4685	goto done;
4686	}
4687	} else {
4688	if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4689	DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4690	fname, strerror(errno) ));
4691	goto done;
4692	}
4693	}
4694
4695	ret = True;
4696
4697	done:
4698
4699	if (file_acl) {
4700	SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4701	}
4702	if (new_file_acl) {
4703	SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4704	}
4705	return ret;
4706	}
4707
4708	/****************************************************************************
4709	Calls from UNIX extensions - POSIX ACL set.
4710	If num_def_acls == 0 then read/modify/write acl after removing all entries
4711	except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4712	****************************************************************************/
4713
4714	bool set_unix_posix_acl(connection_struct conn, files_struct fsp, const char fname, uint16 num_acls, const char pdata)
4715	{
4716	SMB_ACL_T file_acl = NULL;
4717
4718	if (!num_acls) {
4719	/* Remove the ACL from the file. */
4720	return remove_posix_acl(conn, fsp, fname);
4721	}
4722
4723	if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4724	return False;
4725	}
4726
4727	if (fsp && fsp->fh->fd != -1) {
4728	/* The preferred way - use an open fd. */
4729	if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4730	DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4731	fname, strerror(errno) ));
4732	SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4733	return False;
4734	}
4735	} else {
4736	if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4737	DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4738	fname, strerror(errno) ));
4739	SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4740	return False;
4741	}
4742	}
4743
4744	DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4745	SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4746	return True;
4747	}
4748
4749	/********************************************************************
4750	Pull the NT ACL from a file on disk or the OpenEventlog() access
4751	check. Caller is responsible for freeing the returned security
4752	descriptor via TALLOC_FREE(). This is designed for dealing with
4753	user space access checks in smbd outside of the VFS. For example,
4754	checking access rights in OpenEventlog().
4755
4756	Assume we are dealing with files (for now)
4757	********************************************************************/
4758
4759	SEC_DESC get_nt_acl_no_snum( TALLOC_CTX ctx, const char *fname)
4760	{
4761	SEC_DESC psd, ret_sd;
4762	connection_struct *conn;
4763	files_struct finfo;
4764	struct fd_handle fh;
4765	NTSTATUS status;
4766
4767	conn = TALLOC_ZERO_P(ctx, connection_struct);
4768	if (conn == NULL) {
4769	DEBUG(0, ("talloc failed\n"));
4770	return NULL;
4771	}
4772
4773	if (!(conn->params = TALLOC_P(conn, struct share_params))) {
4774	DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4775	TALLOC_FREE(conn);
4776	return NULL;
4777	}
4778
4779	conn->params->service = -1;
4780
4781	set_conn_connectpath(conn, "/");
4782
4783	if (!smbd_vfs_init(conn)) {
4784	DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4785	conn_free(conn);
4786	return NULL;
4787	}
4788
4789	ZERO_STRUCT( finfo );
4790	ZERO_STRUCT( fh );
4791
4792	finfo.fnum = -1;
4793	finfo.conn = conn;
4794	finfo.fh = &fh;
4795	finfo.fh->fd = -1;
4796
4797	status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
4798	&finfo.fsp_name);
4799	if (!NT_STATUS_IS_OK(status)) {
4800	conn_free(conn);
4801	return NULL;
4802	}
4803
4804	if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, DACL_SECURITY_INFORMATION, &psd))) {
4805	DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4806	TALLOC_FREE(finfo.fsp_name);
4807	conn_free(conn);
4808	return NULL;
4809	}
4810
4811	ret_sd = dup_sec_desc( ctx, psd );
4812
4813	TALLOC_FREE(finfo.fsp_name);
4814	conn_free(conn);
4815
4816	return ret_sd;
4817	}
4818
4819	/* Stolen shamelessly from pvfs_default_acl() in source4 :-). */
4820
4821	NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx,
4822	const char *name,
4823	SMB_STRUCT_STAT *psbuf,
4824	SEC_DESC **ppdesc)
4825	{
4826	struct dom_sid owner_sid, group_sid;
4827	size_t size = 0;
4828	SEC_ACE aces[4];
4829	uint32_t access_mask = 0;
4830	mode_t mode = psbuf->st_ex_mode;
4831	SEC_ACL *new_dacl = NULL;
4832	int idx = 0;
4833
4834	DEBUG(10,("make_default_filesystem_acl: file %s mode = 0%o\n",
4835	name, (int)mode ));
4836
4837	uid_to_sid(&owner_sid, psbuf->st_ex_uid);
4838	gid_to_sid(&group_sid, psbuf->st_ex_gid);
4839
4840	/*
4841	We provide up to 4 ACEs
4842	- Owner
4843	- Group
4844	- Everyone
4845	- NT System
4846	*/
4847
4848	if (mode & S_IRUSR) {
4849	if (mode & S_IWUSR) {
4850	access_mask \|= SEC_RIGHTS_FILE_ALL;
4851	} else {
4852	access_mask \|= SEC_RIGHTS_FILE_READ \| SEC_FILE_EXECUTE;
4853	}
4854	}
4855	if (mode & S_IWUSR) {
4856	access_mask \|= SEC_RIGHTS_FILE_WRITE \| SEC_STD_DELETE;
4857	}
4858
4859	init_sec_ace(&aces[idx],
4860	&owner_sid,
4861	SEC_ACE_TYPE_ACCESS_ALLOWED,
4862	access_mask,
4863	0);
4864	idx++;
4865
4866	access_mask = 0;
4867	if (mode & S_IRGRP) {
4868	access_mask \|= SEC_RIGHTS_FILE_READ \| SEC_FILE_EXECUTE;
4869	}
4870	if (mode & S_IWGRP) {
4871	/* note that delete is not granted - this matches posix behaviour */
4872	access_mask \|= SEC_RIGHTS_FILE_WRITE;
4873	}
4874	if (access_mask) {
4875	init_sec_ace(&aces[idx],
4876	&group_sid,
4877	SEC_ACE_TYPE_ACCESS_ALLOWED,
4878	access_mask,
4879	0);
4880	idx++;
4881	}
4882
4883	access_mask = 0;
4884	if (mode & S_IROTH) {
4885	access_mask \|= SEC_RIGHTS_FILE_READ \| SEC_FILE_EXECUTE;
4886	}
4887	if (mode & S_IWOTH) {
4888	access_mask \|= SEC_RIGHTS_FILE_WRITE;
4889	}
4890	if (access_mask) {
4891	init_sec_ace(&aces[idx],
4892	&global_sid_World,
4893	SEC_ACE_TYPE_ACCESS_ALLOWED,
4894	access_mask,
4895	0);
4896	idx++;
4897	}
4898
4899	init_sec_ace(&aces[idx],
4900	&global_sid_System,
4901	SEC_ACE_TYPE_ACCESS_ALLOWED,
4902	SEC_RIGHTS_FILE_ALL,
4903	0);
4904	idx++;
4905
4906	new_dacl = make_sec_acl(ctx,
4907	NT4_ACL_REVISION,
4908	idx,
4909	aces);
4910
4911	if (!new_dacl) {
4912	return NT_STATUS_NO_MEMORY;
4913	}
4914
4915	*ppdesc = make_sec_desc(ctx,
4916	SECURITY_DESCRIPTOR_REVISION_1,
4917	SEC_DESC_SELF_RELATIVE\|SEC_DESC_DACL_PRESENT,
4918	&owner_sid,
4919	&group_sid,
4920	NULL,
4921	new_dacl,
4922	&size);
4923	if (!*ppdesc) {
4924	return NT_STATUS_NO_MEMORY;
4925	}
4926	return NT_STATUS_OK;
4927	}

Note: See TracBrowser for help on using the repository browser.

Download in other formats: